I might be use AssetImporter wrong but there is
-p Set path for scene resources. Default is output file path
so I write
AssetImporter scene myscene1.fbx myscene.scene -p Scene1
Ok, there will be myscene.scene, Scene1/Materials/, Scene1/Models/ and Scene1/Textures/.
But in myscene.scene, there are “links” to Materials/, Models/ and Textures/ (not Scene1/Marerials, Scene1/Models, Scene1/Textures), so scene loading failed.