diff --git a/server.test/NumberTest.cs b/server.test/NumberTest.cs
index ae8af7f..dbb316e 100644
--- a/server.test/NumberTest.cs
+++ b/server.test/NumberTest.cs
@@ -35,57 +35,133 @@ public class NumberTest
     }
 
     /// <summary>
-    /// 测试 BytesToUInt64 的正常与异常情况
+    /// 测试 BytesToUInt64 的正常与异常情况，覆盖不同参数组合
     /// </summary>
     [Fact]
     public void Test_BytesToUInt64()
     {
-        // 正常大端
+        // 正常大端（isLowNumHigh=false）
         var bytes = new byte[] { 0x12, 0x34, 0x56, 0x78, 0xAB, 0xCD, 0xEF, 0x01 };
-        var result = Number.BytesToUInt64((byte[])bytes.Clone(), false);
+        var result = Number.BytesToUInt64((byte[])bytes.Clone());
         Assert.True(result.IsSuccessful);
         Assert.Equal(0x12345678ABCDEF01UL, result.Value);
 
-        // 正常小端
+        // 正常小端（isLowNumHigh=true）
         var bytes2 = new byte[] { 0x01, 0xEF, 0xCD, 0xAB, 0x78, 0x56, 0x34, 0x12 };
         var result2 = Number.BytesToUInt64((byte[])bytes2.Clone(), true);
         Assert.True(result2.IsSuccessful);
         Assert.Equal(0x12345678ABCDEF01UL, result2.Value);
 
-        // 异常：长度超限
-        var result3 = Number.BytesToUInt64(new byte[9], false);
-        Assert.False(result3.IsSuccessful);
+        // 长度不足8字节（numLength=4），大端
+        var bytes3 = new byte[] { 0x12, 0x34, 0x56, 0x78 };
+        var result3 = Number.BytesToUInt64((byte[])bytes3.Clone(), 0, 4, false);
+        Assert.True(result3.IsSuccessful);
+        Assert.Equal(0x1234567800000000UL, result3.Value);
 
-        // 异常：不足8字节
-        var result4 = Number.BytesToUInt64(new byte[] { 0x01, 0x02 }, false);
-        Assert.False(result4.IsSuccessful); // BitConverter.ToUInt64 需要8字节
+        // 长度不足8字节（numLength=4），小端
+        var bytes4 = new byte[] { 0x78, 0x56, 0x34, 0x12 };
+        var result4 = Number.BytesToUInt64((byte[])bytes4.Clone(), 0, 4, true);
+        Assert.True(result4.IsSuccessful);
+        Assert.Equal(0x12345678UL, result4.Value);
+
+        // numLength=0
+        var bytes5 = new byte[] { 0x12, 0x34, 0x56, 0x78 };
+        var result5 = Number.BytesToUInt64((byte[])bytes5.Clone(), 0, 0, false);
+        Assert.True(result5.IsSuccessful);
+        Assert.Equal(0UL, result5.Value);
+
+        // offset测试
+        var bytes6 = new byte[] { 0x00, 0x00, 0x12, 0x34, 0x56, 0x78, 0xAB, 0xCD, 0xEF, 0x01 };
+        var result6 = Number.BytesToUInt64(bytes6, 2, 8, false);
+        Assert.True(result6.IsSuccessful);
+        Assert.Equal(0x12345678ABCDEF01UL, result6.Value);
+
+        // numLength超限（>8），应返回异常
+        var bytes7 = new byte[9];
+        var result7 = Number.BytesToUInt64(bytes7, 0, 9, false);
+        Assert.False(result7.IsSuccessful);
+
+        // offset+numLength超限
+        var bytes8 = new byte[] { 0x01, 0x02, 0x03, 0x04 };
+        var result8 = Number.BytesToUInt64(bytes8, 2, 4, false);
+        Assert.True(result8.IsSuccessful);
+        Assert.Equal(0x0304000000000000UL, result8.Value);
+
+        // bytes长度不足offset+numLength
+        var bytes9 = new byte[] { 0x01, 0x02 };
+        var result9 = Number.BytesToUInt64(bytes9, 1, 2, true);
+        Assert.True(result9.IsSuccessful);
+        Assert.Equal(0x02UL, result9.Value);
+
+        // 空数组
+        var result10 = Number.BytesToUInt64(new byte[0], 0, 0, false);
+        Assert.True(result10.IsSuccessful);
+        Assert.Equal(0UL, result10.Value);
     }
 
     /// <summary>
-    /// 测试 BytesToUInt32 的正常与异常情况
+    /// 测试 BytesToUInt32 的正常与异常情况，覆盖不同参数组合
     /// </summary>
     [Fact]
     public void Test_BytesToUInt32()
     {
-        // 正常大端
+        // 正常大端（isLowNumHigh=false）
         var bytes = new byte[] { 0x12, 0x34, 0x56, 0x78 };
-        var result = Number.BytesToUInt32((byte[])bytes.Clone(), false);
+        var result = Number.BytesToUInt32((byte[])bytes.Clone());
         Assert.True(result.IsSuccessful);
         Assert.Equal(0x12345678U, result.Value);
 
-        // 正常小端
+        // 正常小端（isLowNumHigh=true）
         var bytes2 = new byte[] { 0x78, 0x56, 0x34, 0x12 };
         var result2 = Number.BytesToUInt32((byte[])bytes2.Clone(), true);
         Assert.True(result2.IsSuccessful);
         Assert.Equal(0x12345678U, result2.Value);
 
-        // 异常：长度超限
-        var result3 = Number.BytesToUInt32(new byte[5], false);
-        Assert.False(result3.IsSuccessful);
+        // 长度不足4字节（numLength=2），大端
+        var bytes3 = new byte[] { 0x12, 0x34 };
+        var result3 = Number.BytesToUInt32((byte[])bytes3.Clone(), 0, 2, false);
+        Assert.True(result3.IsSuccessful);
+        Assert.Equal(0x12340000U, result3.Value);
 
-        // 异常：不足4字节
-        var result4 = Number.BytesToUInt32(new byte[] { 0x01, 0x02 }, false);
-        Assert.False(result4.IsSuccessful); // BitConverter.ToUInt32 需要4字节
+        // 长度不足4字节（numLength=2），小端
+        var bytes4 = new byte[] { 0x34, 0x12 };
+        var result4 = Number.BytesToUInt32((byte[])bytes4.Clone(), 0, 2, true);
+        Assert.True(result4.IsSuccessful);
+        Assert.Equal(0x1234U, result4.Value);
+
+        // numLength=0
+        var bytes5 = new byte[] { 0x12, 0x34, 0x56, 0x78 };
+        var result5 = Number.BytesToUInt32((byte[])bytes5.Clone(), 0, 0, false);
+        Assert.True(result5.IsSuccessful);
+        Assert.Equal(0U, result5.Value);
+
+        // offset测试
+        var bytes6 = new byte[] { 0x00, 0x00, 0x12, 0x34, 0x56, 0x78 };
+        var result6 = Number.BytesToUInt32(bytes6, 2, 4, false);
+        Assert.True(result6.IsSuccessful);
+        Assert.Equal(0x12345678U, result6.Value);
+
+        // numLength超限（>4），应返回异常
+        var bytes7 = new byte[5];
+        var result7 = Number.BytesToUInt32(bytes7, 0, 5, false);
+        Assert.False(result7.IsSuccessful);
+
+        // offset+numLength超限
+        var bytes8 = new byte[] { 0x01, 0x02, 0x03, 0x04 };
+        var result8 = Number.BytesToUInt32(bytes8, 2, 2, false);
+        Assert.True(result8.IsSuccessful);
+        Assert.Equal(0x03040000U, result8.Value);
+
+        // bytes长度不足offset+numLength
+        var bytes9 = new byte[] { 0x01, 0x02 };
+        var result9 = Number.BytesToUInt32(bytes9, 1, 1, true);
+        Assert.True(result9.IsSuccessful);
+        Assert.Equal(0x02U, result9.Value);
+
+        // 空数组
+        var result10 = Number.BytesToUInt32(new byte[0], 0, 0, false);
+        Assert.True(result10.IsSuccessful);
+        Assert.Equal(0U, result10.Value);
     }
 
     /// <summary>
diff --git a/server/src/Common/Number.cs b/server/src/Common/Number.cs
index 56a2266..d8ab922 100644
--- a/server/src/Common/Number.cs
+++ b/server/src/Common/Number.cs
@@ -78,6 +78,56 @@ public class Number
         return arr;
     }
 
+    /// <summary>
+    /// 二进制字节数组转成64bits整数
+    /// </summary>
+    /// <param name="bytes">二进制字节数组</param>
+    /// <param name="offset">字节数组偏移量</param>
+    /// <param name="numLength">字节数组长度</param>
+    /// <param name="isLowNumHigh">是否高位在数组索引低</param>
+    /// <returns>整数</returns>
+    public static Result<UInt64> BytesToUInt64(byte[] bytes, int offset = 0, int numLength = 8, bool isLowNumHigh = false)
+    {
+        if (bytes.Length < offset)
+        {
+            return new(new ArgumentException($"The Length of bytes is less than offset"));
+        }
+
+        if (numLength > 8)
+        {
+            return new(new ArgumentException($"The Length of bytes is greater than 8"));
+        }
+
+        if (numLength <= 0) return 0;
+
+        try
+        {
+            byte[] numBytes = new byte[8]; // 8字节
+            int copyLen = Math.Min(numLength, bytes.Length - offset);
+
+            if (isLowNumHigh)
+            {
+                // 小端：拷贝到低位
+                Buffer.BlockCopy(bytes, offset, numBytes, 0, copyLen);
+            }
+            else
+            {
+                // 大端：拷贝到高位
+                byte[] temp = new byte[copyLen];
+                Buffer.BlockCopy(bytes, offset, temp, 0, copyLen);
+                Array.Reverse(temp);
+                Buffer.BlockCopy(temp, 0, numBytes, 8 - copyLen, copyLen);
+            }
+
+            UInt64 num = BitConverter.ToUInt64(numBytes, 0);
+            return num;
+        }
+        catch (Exception error)
+        {
+            return new(error);
+        }
+    }
+
     /// <summary>
     /// 二进制字节数组转成64bits整数
     /// </summary>
@@ -86,25 +136,78 @@ public class Number
     /// <returns>整数</returns>
     public static Result<UInt64> BytesToUInt64(byte[] bytes, bool isLowNumHigh = false)
     {
-        if (bytes.Length > 8)
+        return BytesToUInt64(bytes, 0, 8, isLowNumHigh);
+    }
+
+    /// <summary>
+    /// 二进制字节数组转成64bits整数
+    /// </summary>
+    /// <param name="bytes">二进制字节数组</param>
+    /// <returns>整数</returns>
+    public static Result<UInt64> BytesToUInt64(byte[] bytes)
+    {
+        return BytesToUInt64(bytes, 0, 8, false);
+    }
+
+    /// <summary>
+    /// 二进制字节数组转成32bits整数
+    /// </summary>
+    /// <param name="bytes">二进制字节数组</param>
+    /// <param name="offset">字节数组偏移量</param>
+    /// <param name="numLength">整形所占字节数组长度</param>
+    /// <param name="isLowNumHigh">是否高位在数组索引低</param>
+    /// <returns>整数</returns>
+    public static Result<UInt32> BytesToUInt32(byte[] bytes, int offset = 0, int numLength = 4, bool isLowNumHigh = false)
+    {
+        if (bytes.Length < offset)
         {
-            return new(new ArgumentException(
-                "Unsigned long number can't over 8 bytes(64 bits).",
-                nameof(bytes)
-            ));
+            return new(new ArgumentException($"The Length of bytes is less than offset"));
         }
 
-        UInt64 num = 0;
-        int len = bytes.Length;
+        if (numLength > 4)
+        {
+            return new(new ArgumentException($"The Length of bytes is greater than 4"));
+        }
+
+        if (bytes.Length < offset)
+        {
+            return new(new ArgumentException($"The Length of bytes is less than offset"));
+        }
+
+        if (numLength > 4)
+        {
+            return new(new ArgumentException($"The Length of bytes is greater than 4"));
+        }
+
+        if (numLength <= 0) return 0;
 
         try
         {
-            if (!isLowNumHigh)
-            {
-                Array.Reverse(bytes);
-            }
-            num = BitConverter.ToUInt64(bytes, 0);
+            byte[] numBytes = new byte[4]; // 4字节
+            int copyLen = Math.Min(numLength, bytes.Length - offset);
+            if (copyLen < 0) copyLen = 0;
 
+            if (isLowNumHigh)
+            {
+                // 小端：拷贝到低位
+                if (copyLen > 0)
+                {
+                    Buffer.BlockCopy(bytes, offset, numBytes, 0, copyLen);
+                }
+            }
+            else
+            {
+                // 大端：拷贝到高位
+                if (copyLen > 0)
+                {
+                    byte[] temp = new byte[copyLen];
+                    Buffer.BlockCopy(bytes, offset, temp, 0, copyLen);
+                    Array.Reverse(temp);
+                    Buffer.BlockCopy(temp, 0, numBytes, 4 - copyLen, copyLen);
+                }
+            }
+
+            UInt32 num = BitConverter.ToUInt32(numBytes, 0);
             return num;
         }
         catch (Exception error)
@@ -121,32 +224,17 @@ public class Number
     /// <returns>整数</returns>
     public static Result<UInt32> BytesToUInt32(byte[] bytes, bool isLowNumHigh = false)
     {
-        if (bytes.Length > 4)
-        {
-            return new(new ArgumentException(
-                "Unsigned long number can't over 4 bytes(32 bits).",
-                nameof(bytes)
-            ));
-        }
-
-        UInt32 num = 0;
-        int len = bytes.Length;
-
-        try
-        {
-            if (!isLowNumHigh)
-            {
-                Array.Reverse(bytes);
-            }
-            num = BitConverter.ToUInt32(bytes, 0);
-
-            return num;
-        }
-        catch (Exception error)
-        {
-            return new(error);
-        }
+        return BytesToUInt32(bytes, 0, 4, isLowNumHigh);
+    }
 
+    /// <summary>
+    /// 二进制字节数组转成32bits整数
+    /// </summary>
+    /// <param name="bytes">二进制字节数组</param>
+    /// <returns>整数</returns>
+    public static Result<UInt32> BytesToUInt32(byte[] bytes)
+    {
+        return BytesToUInt32(bytes, 0, 4, false);
     }
 
     /// <summary>