diff --git a/entity/singleton.go b/entity/singleton.go
index b5fb73b..79cde10 100644
--- a/entity/singleton.go
+++ b/entity/singleton.go
@@ -3,6 +3,7 @@ package entity
 import (
 	"time"
 
+	"github.com/yohamta/donburi/filter"
 	"joylink.club/ecs"
 	"joylink.club/rtsssimulation/component"
 	"joylink.club/rtsssimulation/repository"
@@ -10,6 +11,9 @@ import (
 
 // 初始化世界数据
 func LoadWorldData(w ecs.World, repo *repository.Repository) {
+	if repo == nil {
+		panic("repo不能为nil")
+	}
 	entry := w.Create(component.WorldDataType)
 	component.WorldDataType.Set(entry, &component.WorldData{
 		Repo:      repo,
@@ -18,8 +22,13 @@ func LoadWorldData(w ecs.World, repo *repository.Repository) {
 	})
 }
 
+var query = ecs.NewQuery(filter.Contains(component.WorldDataType))
+
 // 获取世界数据
 func GetWorldData(w ecs.World) *component.WorldData {
-	entry := component.WorldDataType.MustFirst(w)
-	return component.WorldDataType.Get(entry)
+	entry, ok := query.First(w)
+	if ok {
+		return component.WorldDataType.Get(entry)
+	}
+	panic("世界数据不存在")
 }
diff --git a/examples/main.go b/examples/main.go
new file mode 100644
index 0000000..f729447
--- /dev/null
+++ b/examples/main.go
@@ -0,0 +1,10 @@
+package main
+
+import (
+	rtss_simulation "joylink.club/rtsssimulation"
+	"joylink.club/rtsssimulation/repository"
+)
+
+func main() {
+	rtss_simulation.NewSimulation(&repository.Repository{})
+}