Research on value co-creation of platform based business ecosystem Research on the value co-creation of logistics cluster service ecosystem Research on service value co-creation of knowledge-intensive business service system Research on service value co-creation of knowledge-intensive business service system. 并列题名：Research on the value co-creation of logistics cluster service ecosystem 并列题名：Research on service value co-creation of knowledge-intensive business service system Research on strategic renewal of online freight platform based on service ecosystem research on the construction of animation performance system 并列题名：Research on strategic renewal of online freight platform based on service ecosystem