diff --git a/game/builtin/item.go b/game/builtin/item.go
new file mode 100644
index 0000000..d3f0775
--- /dev/null
+++ b/game/builtin/item.go
@@ -0,0 +1,51 @@
+package builtin
+
+import "github.com/kercylan98/minotaur/utils/huge"
+
+func NewItem[ID comparable](id ID, options ...ItemOption[ID]) *Item[ID] {
+	item := &Item[ID]{
+		id: id,
+	}
+	for _, option := range options {
+		option(item)
+	}
+	return item
+}
+
+type Item[ID comparable] struct {
+	id         ID
+	stackLimit *huge.Int
+	count      *huge.Int
+}
+
+func (slf *Item[ID]) GetID() ID {
+	return slf.id
+}
+
+func (slf *Item[ID]) GetCount() *huge.Int {
+	return slf.count
+}
+
+func (slf *Item[ID]) GetStackLimit() *huge.Int {
+	return slf.stackLimit
+}
+
+func (slf *Item[ID]) SetCount(count *huge.Int) {
+	if count.LessThan(huge.IntZero) {
+		slf.count = huge.IntZero.Copy()
+		return
+	}
+	slf.count = count.Copy()
+}
+
+func (slf *Item[ID]) ChangeCount(count *huge.Int) error {
+	newCount := slf.count.Copy().Add(count)
+	if newCount.LessThan(huge.IntZero) {
+		return ErrItemInsufficientQuantityDeduction
+	}
+	if newCount.GreaterThan(slf.stackLimit) {
+		return ErrItemStackLimit
+	}
+	slf.count = newCount
+	return nil
+}
diff --git a/game/builtin/item_errors.go b/game/builtin/item_errors.go
index e036a3d..25e14bd 100644
--- a/game/builtin/item_errors.go
+++ b/game/builtin/item_errors.go
@@ -1,5 +1,8 @@
 package builtin
 
+import "errors"
+
 var (
-	ErrItemCountException = "the number of items cannot be empty and must be a positive integer"
+	ErrItemInsufficientQuantityDeduction = errors.New("insufficient quantity deduction")
+	ErrItemStackLimit                    = errors.New("the number of items reaches the stacking limit")
 )
diff --git a/game/builtin/item_options.go b/game/builtin/item_options.go
new file mode 100644
index 0000000..55d43c7
--- /dev/null
+++ b/game/builtin/item_options.go
@@ -0,0 +1,16 @@
+package builtin
+
+import "github.com/kercylan98/minotaur/utils/huge"
+
+type ItemOption[ID comparable] func(item *Item[ID])
+
+// WithItemStackLimit 通过特定堆叠上限创建物品
+//   - 默认无限制
+func WithItemStackLimit[ID comparable](stackLimit *huge.Int) ItemOption[ID] {
+	return func(item *Item[ID]) {
+		if stackLimit == nil || stackLimit.LessThanOrEqualTo(huge.IntZero) {
+			return
+		}
+		item.stackLimit = stackLimit
+	}
+}
diff --git a/game/item.go b/game/item.go
new file mode 100644
index 0000000..73742c3
--- /dev/null
+++ b/game/item.go
@@ -0,0 +1,17 @@
+package game
+
+import "github.com/kercylan98/minotaur/utils/huge"
+
+// Item 物品
+type Item[ID comparable] interface {
+	// GetID 获取物品id
+	GetID() ID
+	// GetCount 获取物品数量
+	GetCount() *huge.Int
+	// GetStackLimit 获取堆叠上限
+	GetStackLimit() *huge.Int
+	// SetCount 设置物品数量
+	SetCount(count *huge.Int)
+	// ChangeCount 改变物品数量
+	ChangeCount(count *huge.Int) error
+}
diff --git a/server/cross.go b/server/cross.go
new file mode 100644
index 0000000..6e83318
--- /dev/null
+++ b/server/cross.go
@@ -0,0 +1,9 @@
+package server
+
+// Cross 跨服功能接口实现
+type Cross interface {
+	// PushPacket 推送数据包
+	PushPacket(serverId int64, packet []byte) error
+
+	//
+}