diff --git a/backend/services/assetService/service/material_service.go b/backend/services/assetService/service/material_service.go
new file mode 100644
index 0000000..9abc833
--- /dev/null
+++ b/backend/services/assetService/service/material_service.go
@@ -0,0 +1,96 @@
+package service
+
+import (
+	"errors"
+
+	"github.com/topfans/backend/pkg/models"
+	"github.com/topfans/backend/services/assetService/repository"
+	"gorm.io/gorm"
+)
+
+// MaterialService 素材业务逻辑层
+type MaterialService struct {
+	materialRepo   *repository.MaterialRepository
+	relationRepo   *repository.AssetMaterialRelationRepository
+}
+
+// NewMaterialService 创建素材 Service
+func NewMaterialService(materialRepo *repository.MaterialRepository, relationRepo *repository.AssetMaterialRelationRepository) *MaterialService {
+	return &MaterialService{
+		materialRepo: materialRepo,
+		relationRepo: relationRepo,
+	}
+}
+
+// UploadMaterial 上传素材（含 hash 去重）
+func (s *MaterialService) UploadMaterial(m *models.Material) (*models.Material, error) {
+	existing, err := s.materialRepo.FindByHash(m.Hash, m.StarID)
+	if err == nil && existing != nil {
+		return existing, nil
+	}
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+
+	if err := s.materialRepo.Create(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// BindMaterials 绑定资产素材关联
+func (s *MaterialService) BindMaterials(assetID int64, items []BindMaterialItem) ([]*models.AssetMaterialRelation, error) {
+	if len(items) == 0 {
+		return nil, errors.New("素材列表不能为空")
+	}
+
+	relations := make([]*models.AssetMaterialRelation, 0, len(items))
+	for _, item := range items {
+		rel := &models.AssetMaterialRelation{
+			AssetID:      assetID,
+			MaterialID:   item.MaterialID,
+			MaterialType: item.MaterialType,
+			LayerOrder:   int(item.LayerOrder),
+			PosX:         item.PosX,
+			PosY:         item.PosY,
+			Opacity:      item.Opacity,
+			Rotation:     item.Rotation,
+			ScaleX:       item.ScaleX,
+			ScaleY:       item.ScaleY,
+		}
+		relations = append(relations, rel)
+	}
+
+	if err := s.relationRepo.BatchCreate(relations); err != nil {
+		return nil, err
+	}
+	return relations, nil
+}
+
+// GetAssetMaterials 获取资产素材列表
+func (s *MaterialService) GetAssetMaterials(assetID int64) ([]*models.AssetMaterialRelation, error) {
+	return s.relationRepo.FindByAssetID(assetID)
+}
+
+// UpdateLayerOrder 更新图层顺序
+func (s *MaterialService) UpdateLayerOrder(assetID int64, orders map[int64]int) error {
+	return s.relationRepo.UpdateLayerOrder(assetID, orders)
+}
+
+// UnbindMaterial 解绑素材
+func (s *MaterialService) UnbindMaterial(relationID int64) error {
+	return s.relationRepo.SoftDelete(relationID)
+}
+
+// BindMaterialItem 绑定素材项
+type BindMaterialItem struct {
+	MaterialID   int64
+	MaterialType string
+	LayerOrder   int32
+	PosX         *float64
+	PosY         *float64
+	Opacity      *float64
+	Rotation     *float64
+	ScaleX       *float64
+	ScaleY       *float64
+}