diff --git a/clause/where.go b/clause/where.go
index 2c3c90f18..39a9f8e34 100644
--- a/clause/where.go
+++ b/clause/where.go
@@ -181,7 +181,7 @@ func (not NotConditions) Build(builder Builder) {
 
 		for idx, c := range not.Exprs {
 			if idx > 0 {
-				builder.WriteString(AndWithSpace)
+				builder.WriteString(OrWithSpace)
 			}
 
 			if negationBuilder, ok := c.(NegationExpressionBuilder); ok {
diff --git a/clause/where_test.go b/clause/where_test.go
index ad23a4ed5..fe87c0ba4 100644
--- a/clause/where_test.go
+++ b/clause/where_test.go
@@ -56,7 +56,7 @@ func TestWhere(t *testing.T) {
 			}, clause.Where{
 				Exprs: []clause.Expression{clause.Or(clause.Not(clause.Gt{Column: "score", Value: 100}), clause.Like{Column: "name", Value: "%linus%"})},
 			}},
-			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) OR `name` <> ? AND (`score` <= ? OR `name` LIKE ?)",
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? OR `age` <= ?) OR `name` <> ? AND (`score` <= ? OR `name` LIKE ?)",
 			[]interface{}{"1", 18, "jinzhu", 100, "%linus%"},
 		},
 		{
@@ -70,21 +70,21 @@ func TestWhere(t *testing.T) {
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
 				Exprs: []clause.Expression{clause.Not(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}), clause.And(clause.Expr{SQL: "`score` <= ?", Vars: []interface{}{100}, WithoutParentheses: false})},
 			}},
-			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) AND `score` <= ?",
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? OR `age` <= ?) AND `score` <= ?",
 			[]interface{}{"1", 18, 100},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
 				Exprs: []clause.Expression{clause.Not(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}), clause.Expr{SQL: "`score` <= ?", Vars: []interface{}{100}, WithoutParentheses: false}},
 			}},
-			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) AND `score` <= ?",
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? OR `age` <= ?) AND `score` <= ?",
 			[]interface{}{"1", 18, 100},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
 				Exprs: []clause.Expression{clause.Not(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}), clause.Or(clause.Expr{SQL: "`score` <= ?", Vars: []interface{}{100}, WithoutParentheses: false})},
 			}},
-			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) OR `score` <= ?",
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? OR `age` <= ?) OR `score` <= ?",
 			[]interface{}{"1", 18, 100},
 		},
 		{
@@ -102,7 +102,7 @@ func TestWhere(t *testing.T) {
 				Exprs: []clause.Expression{clause.Not(clause.Eq{Column: clause.PrimaryColumn, Value: "1"},
 					clause.And(clause.Expr{SQL: "`score` <= ?", Vars: []interface{}{100}, WithoutParentheses: false}))},
 			}},
-			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND NOT `score` <= ?)",
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? OR NOT `score` <= ?)",
 			[]interface{}{"1", 100},
 		},
 		{
@@ -116,16 +116,21 @@ func TestWhere(t *testing.T) {
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
 				Exprs: []clause.Expression{
-					clause.Not(clause.AndConditions{
-						Exprs: []clause.Expression{
-							clause.Eq{Column: clause.PrimaryColumn, Value: "1"},
-							clause.Gt{Column: "age", Value: 18},
-						}}, clause.OrConditions{
-						Exprs: []clause.Expression{
-							clause.Lt{Column: "score", Value: 100},
+					clause.Not(
+						clause.AndConditions{
+							Exprs: []clause.Expression{
+								clause.Eq{Column: clause.PrimaryColumn, Value: "1"},
+								clause.Gt{Column: "age", Value: 18},
+							},
 						},
-					}),
-				}}},
+						clause.OrConditions{
+							Exprs: []clause.Expression{
+								clause.Lt{Column: "score", Value: 100},
+							},
+						},
+					),
+				},
+			}},
 			"SELECT * FROM `users` WHERE NOT ((`users`.`id` = ? AND `age` > ?) OR `score` < ?)",
 			[]interface{}{"1", 18, 100},
 		},
diff --git a/tests/query_test.go b/tests/query_test.go
index 566763c51..24510b78b 100644
--- a/tests/query_test.go
+++ b/tests/query_test.go
@@ -551,7 +551,7 @@ func TestNot(t *testing.T) {
 	}
 
 	result = dryDB.Not(User{Name: "jinzhu", Age: 18}).First(&User{})
-	if !regexp.MustCompile("SELECT \\* FROM .*users.* WHERE .*users.*..*name.* <> .+ AND .*users.*..*age.* <> .+").MatchString(result.Statement.SQL.String()) {
+	if !regexp.MustCompile("SELECT \\* FROM .*users.* WHERE .*users.*..*name.* <> .+ OR .*users.*..*age.* <> .+").MatchString(result.Statement.SQL.String()) {
 		t.Fatalf("Build NOT condition, but got %v", result.Statement.SQL.String())
 	}
 
@@ -608,7 +608,7 @@ func TestNotWithAllFields(t *testing.T) {
 	}
 
 	result = dryDB.Not(User{Name: "jinzhu", Age: 18}).First(&User{})
-	if !regexp.MustCompile(userQuery + "WHERE .*users.*..*name.* <> .+ AND .*users.*..*age.* <> .+").MatchString(result.Statement.SQL.String()) {
+	if !regexp.MustCompile(userQuery + "WHERE .*users.*..*name.* <> .+ OR .*users.*..*age.* <> .+").MatchString(result.Statement.SQL.String()) {
 		t.Fatalf("Build NOT condition, but got %v", result.Statement.SQL.String())
 	}
 }