As the core and foundation of the business ecosystem, the platform determines its structure and operation mode. The research on platform strategy and business ecosystem is receiving more and more attention from all walks of life. This paper first provided the concept of a platform-based business ecosystem. Then, on the basis of the platform's "control mode" and "position on the industry chain, it designed four types of construction modes of business ecosystem: open participation, open technology, close symbiosis and channel control. In addition, combined with typical cases, it discussed the structure and operating characteristics of each type of business ecosystem. Finally, it analyzed weak points of this study and made some prospects for future study.