diff --git a/database/gdb/gdb_model.go b/database/gdb/gdb_model.go
index 4769aaa4d..7ce229346 100644
--- a/database/gdb/gdb_model.go
+++ b/database/gdb/gdb_model.go
@@ -136,6 +136,9 @@ func (c *Core) Model(tableNameQueryOrStruct ...interface{}) *Model {
 		extraArgs:  extraArgs,
 	}
 	m.whereBuilder = m.Builder()
+	// Assign the safe attribute of WhereBuilder to nil,
+	// to make it use the safe attribute of its bound model.
+	m.whereBuilder.safe = nil
 	if defaultModelSafe {
 		m.safe = true
 	}
@@ -262,7 +265,7 @@ func (m *Model) Clone() *Model {
 	// Basic attributes copy.
 	*newModel = *m
 	// WhereBuilder copy, note the attribute pointer.
-	newModel.whereBuilder = m.whereBuilder.Clone()
+	newModel.whereBuilder = m.whereBuilder.clone()
 	newModel.whereBuilder.model = newModel
 	// Shallow copy slice attributes.
 	if n := len(m.extraArgs); n > 0 {
diff --git a/database/gdb/gdb_model_builder.go b/database/gdb/gdb_model_builder.go
index 0a1ccd6ff..7687da675 100644
--- a/database/gdb/gdb_model_builder.go
+++ b/database/gdb/gdb_model_builder.go
@@ -8,12 +8,11 @@ package gdb
 
 import (
 	"fmt"
-
-	"github.com/gogf/gf/v2/text/gstr"
 )
 
 type WhereBuilder struct {
-	model       *Model        // Bound to parent model.
+	safe        *bool         // If nil, it uses the safe attribute of its model.
+	model       *Model        // A WhereBuilder should be bound to certain Model.
 	whereHolder []WhereHolder // Condition strings for where operation.
 }
 
@@ -27,7 +26,10 @@ type WhereHolder struct {
 }
 
 func (m *Model) Builder() *WhereBuilder {
+	// The WhereBuilder is safe in default when it is created using Builder().
+	var isSafe = true
 	b := &WhereBuilder{
+		safe:        &isSafe,
 		model:       m,
 		whereHolder: make([]WhereHolder, 0),
 	}
@@ -37,15 +39,22 @@ func (m *Model) Builder() *WhereBuilder {
 // getBuilder creates and returns a cloned WhereBuilder of current WhereBuilder if `safe` is true,
 // or else it returns the current WhereBuilder.
 func (b *WhereBuilder) getBuilder() *WhereBuilder {
-	if !b.model.safe {
+	var isSafe bool
+	if b.safe != nil {
+		isSafe = *b.safe
+	} else {
+		isSafe = b.model.safe
+	}
+	if !isSafe {
 		return b
 	} else {
-		return b.Clone()
+		return b.clone()
 	}
 }
 
-func (b *WhereBuilder) Clone() *WhereBuilder {
+func (b *WhereBuilder) clone() *WhereBuilder {
 	newBuilder := b.model.Builder()
+	newBuilder.safe = b.safe
 	newBuilder.whereHolder = make([]WhereHolder, len(b.whereHolder))
 	copy(newBuilder.whereHolder, b.whereHolder)
 	return newBuilder
@@ -63,24 +72,7 @@ func (b *WhereBuilder) Build() (conditionWhere string, conditionArgs []interface
 				holder.Prefix = autoPrefix
 			}
 			switch holder.Operator {
-			case whereHolderOperatorWhere:
-				if conditionWhere == "" {
-					newWhere, newArgs := formatWhereHolder(ctx, b.model.db, formatWhereHolderInput{
-						WhereHolder: holder,
-						OmitNil:     b.model.option&optionOmitNilWhere > 0,
-						OmitEmpty:   b.model.option&optionOmitEmptyWhere > 0,
-						Schema:      b.model.schema,
-						Table:       tableForMappingAndFiltering,
-					})
-					if len(newWhere) > 0 {
-						conditionWhere = newWhere
-						conditionArgs = newArgs
-					}
-					continue
-				}
-				fallthrough
-
-			case whereHolderOperatorAnd:
+			case whereHolderOperatorWhere, whereHolderOperatorAnd:
 				newWhere, newArgs := formatWhereHolder(ctx, b.model.db, formatWhereHolderInput{
 					WhereHolder: holder,
 					OmitNil:     b.model.option&optionOmitNilWhere > 0,
@@ -120,24 +112,5 @@ func (b *WhereBuilder) Build() (conditionWhere string, conditionArgs []interface
 			}
 		}
 	}
-	// Soft deletion.
-	softDeletingCondition := b.model.getConditionForSoftDeleting()
-	if b.model.rawSql != "" && conditionWhere != "" {
-		if gstr.ContainsI(b.model.rawSql, " WHERE ") {
-			conditionWhere = " AND " + conditionWhere
-		} else {
-			conditionWhere = " WHERE " + conditionWhere
-		}
-	} else if !b.model.unscoped && softDeletingCondition != "" {
-		if conditionWhere == "" {
-			conditionWhere = fmt.Sprintf(` WHERE %s`, softDeletingCondition)
-		} else {
-			conditionWhere = fmt.Sprintf(` WHERE (%s) AND %s`, conditionWhere, softDeletingCondition)
-		}
-	} else {
-		if conditionWhere != "" {
-			conditionWhere = " WHERE " + conditionWhere
-		}
-	}
 	return
 }
diff --git a/database/gdb/gdb_model_builder_where.go b/database/gdb/gdb_model_builder_where.go
index 5803f8d82..0a4e45de7 100644
--- a/database/gdb/gdb_model_builder_where.go
+++ b/database/gdb/gdb_model_builder_where.go
@@ -15,20 +15,20 @@ import (
 // doWhereType sets the condition statement for the model. The parameter `where` can be type of
 // string/map/gmap/slice/struct/*struct, etc. Note that, if it's called more than one times,
 // multiple conditions will be joined into where statement using "AND".
-func (b *WhereBuilder) doWhereType(t string, where interface{}, args ...interface{}) *WhereBuilder {
+func (b *WhereBuilder) doWhereType(whereType string, where interface{}, args ...interface{}) *WhereBuilder {
 	builder := b.getBuilder()
 	if builder.whereHolder == nil {
 		builder.whereHolder = make([]WhereHolder, 0)
 	}
-	if t == "" {
+	if whereType == "" {
 		if len(args) == 0 {
-			t = whereHolderTypeNoArgs
+			whereType = whereHolderTypeNoArgs
 		} else {
-			t = whereHolderTypeDefault
+			whereType = whereHolderTypeDefault
 		}
 	}
 	builder.whereHolder = append(builder.whereHolder, WhereHolder{
-		Type:     t,
+		Type:     whereType,
 		Operator: whereHolderOperatorWhere,
 		Where:    where,
 		Args:     args,
@@ -59,6 +59,20 @@ func (b *WhereBuilder) doWherefType(t string, format string, args ...interface{}
 // Where("age IN(?,?)", 18, 50)
 // Where(User{ Id : 1, UserName : "john"}).
 func (b *WhereBuilder) Where(where interface{}, args ...interface{}) *WhereBuilder {
+	var builder *WhereBuilder
+	switch v := where.(type) {
+	case WhereBuilder:
+		builder = &v
+	case *WhereBuilder:
+		builder = v
+	}
+	if builder != nil {
+		conditionWhere, conditionArgs := builder.Build()
+		if len(b.whereHolder) == 0 {
+			conditionWhere = "(" + conditionWhere + ")"
+		}
+		return b.doWhereType(``, conditionWhere, conditionArgs...)
+	}
 	return b.doWhereType(``, where, args...)
 }
 
diff --git a/database/gdb/gdb_model_select.go b/database/gdb/gdb_model_select.go
index b7f782f4a..d39fc4728 100644
--- a/database/gdb/gdb_model_select.go
+++ b/database/gdb/gdb_model_select.go
@@ -616,6 +616,24 @@ func (m *Model) formatCondition(ctx context.Context, limit1 bool, isCountStateme
 	}
 	// WHERE
 	conditionWhere, conditionArgs = m.whereBuilder.Build()
+	softDeletingCondition := m.getConditionForSoftDeleting()
+	if m.rawSql != "" && conditionWhere != "" {
+		if gstr.ContainsI(m.rawSql, " WHERE ") {
+			conditionWhere = " AND " + conditionWhere
+		} else {
+			conditionWhere = " WHERE " + conditionWhere
+		}
+	} else if !m.unscoped && softDeletingCondition != "" {
+		if conditionWhere == "" {
+			conditionWhere = fmt.Sprintf(` WHERE %s`, softDeletingCondition)
+		} else {
+			conditionWhere = fmt.Sprintf(` WHERE (%s) AND %s`, conditionWhere, softDeletingCondition)
+		}
+	} else {
+		if conditionWhere != "" {
+			conditionWhere = " WHERE " + conditionWhere
+		}
+	}
 	// HAVING.
 	if len(m.having) > 0 {
 		havingHolder := WhereHolder{
diff --git a/database/gdb/gdb_core_sharding.go b/database/gdb/gdb_model_sharding.go
similarity index 100%
rename from database/gdb/gdb_core_sharding.go
rename to database/gdb/gdb_model_sharding.go
diff --git a/database/gdb/gdb_z_mysql_feature_model_builder_test.go b/database/gdb/gdb_z_mysql_feature_model_builder_test.go
new file mode 100644
index 000000000..43e319731
--- /dev/null
+++ b/database/gdb/gdb_z_mysql_feature_model_builder_test.go
@@ -0,0 +1,46 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gdb_test
+
+import (
+	"testing"
+
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/test/gtest"
+)
+
+func Test_Model_Builder(t *testing.T) {
+	table := createInitTable()
+	defer dropTable(table)
+
+	gtest.C(t, func(t *gtest.T) {
+		m := db.Model(table)
+		b := m.Builder()
+
+		all, err := m.Where(
+			b.Where("id", g.Slice{1, 2, 3}).WhereOr("id", g.Slice{4, 5, 6}),
+		).All()
+		t.AssertNil(err)
+		t.Assert(len(all), 6)
+	})
+
+	gtest.C(t, func(t *gtest.T) {
+		m := db.Model(table)
+		b := m.Builder()
+
+		all, err := m.Where(
+			b.Where("id", g.Slice{1, 2, 3}).WhereOr("id", g.Slice{4, 5, 6}),
+		).Where(
+			b.Where("id", g.Slice{2, 3}).WhereOr("id", g.Slice{5, 6}),
+		).Where(
+			b.Where("id", g.Slice{3}).Where("id", g.Slice{1, 2, 3}),
+		).All()
+		t.AssertNil(err)
+		t.Assert(len(all), 1)
+	})
+
+}