Application of 3D is already a wide range used technology. With the development of Internet, more and more applications are extended to the Internet, but the application relates to the 3D is not enough, in recent years, the development of many new technologies for 3D technology based on Web has injected new vitality. This paper mainly studies Web3D Technology based on the Adobe Flash platform. First introduces the work principle of Flash3D, then describes some 3D engine, finally, based on a 3D engine, the paper researched a series of key technologies to create a 3D scene, and realize a demo example.