diff --git a/FreeSql.Tests/FreeSql.Tests/UnitTest5.cs b/FreeSql.Tests/FreeSql.Tests/UnitTest5.cs
index 7d4ec648..a1db0c8d 100644
--- a/FreeSql.Tests/FreeSql.Tests/UnitTest5.cs
+++ b/FreeSql.Tests/FreeSql.Tests/UnitTest5.cs
@@ -16,6 +16,27 @@ namespace FreeSql.Tests
 {
     public class UnitTest5
     {
+        // DTO
+        public class TestDto
+        {
+            public decimal ratio { get; set; }
+            public bool is_lock { get; set; }
+        }
+        [Fact]
+        public void TestDoubleWhereBug()
+        {
+            var fsql = g.mysql;
+            // 测试例子
+            var test = new TestDto();
+            test.ratio = 2.1M;
+            var sql = fsql.Update<TestDto>().Set(m => new TestDto
+            {
+                is_lock = test.ratio < 1  //这里生成的SQL语句有问题 ratio = 0.9 或 1.9 或 2.1 等等都是生成的是1
+            }).Where(m => test.ratio < 1).ToSql();
+            Assert.Equal(@"UPDATE TestDto SET is_lock = 2.1 < 1
+WHERE (2.1 < 1)", sql);
+        }
+
         [Fact]
         public void TestLambdaParameterWhereIn()
         {
diff --git a/FreeSql/Internal/CommonProvider/UpdateProvider.cs b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
index cd1bb84d..ea98dc63 100644
--- a/FreeSql/Internal/CommonProvider/UpdateProvider.cs
+++ b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
@@ -526,7 +526,8 @@ namespace FreeSql.Internal.CommonProvider
                             var memberName = initExp.Bindings[a].Member.Name;
                             if (_table.ColumnsByCsIgnore.ContainsKey(memberName)) continue;
                             if (_table.ColumnsByCs.TryGetValue(memberName, out var col) == false) throw new Exception($"找不到属性：{memberName}");
-                            var memberValue = _commonExpression.ExpressionLambdaToSql(initAssignExp.Expression, new CommonExpression.ExpTSC { isQuoteName = true, mapType = col.Attribute.MapType });
+                            var memberValue = _commonExpression.ExpressionLambdaToSql(initAssignExp.Expression, new CommonExpression.ExpTSC { isQuoteName = true, 
+                                mapType = initAssignExp.Expression is BinaryExpression ? null : col.Attribute.MapType });
                             _setIncr.Append(", ").Append(_commonUtils.QuoteSqlName(col.Attribute.Name)).Append(" = ").Append(memberValue);
                         }
                     }
@@ -540,7 +541,8 @@ namespace FreeSql.Internal.CommonProvider
                             var memberName = newExp.Members[a].Name;
                             if (_table.ColumnsByCsIgnore.ContainsKey(memberName)) continue;
                             if (_table.ColumnsByCs.TryGetValue(memberName, out var col) == false) throw new Exception($"找不到属性：{memberName}");
-                            var memberValue = _commonExpression.ExpressionLambdaToSql(newExp.Arguments[a], new CommonExpression.ExpTSC { isQuoteName = true, mapType = col.Attribute.MapType });
+                            var memberValue = _commonExpression.ExpressionLambdaToSql(newExp.Arguments[a], new CommonExpression.ExpTSC { isQuoteName = true, 
+                                mapType = newExp.Arguments[a] is BinaryExpression ? null : col.Attribute.MapType });
                             _setIncr.Append(", ").Append(_commonUtils.QuoteSqlName(col.Attribute.Name)).Append(" = ").Append(memberValue);
                         }
                     }