In an environment of increasingly fierce platform competition, ambidextrous innovation is one of the most important sources for platform companies to gain competitive advantage. The research analyzes the mecha‐ nism of platform openness and platform attractiveness to the ambidextrous innovation of platform companies by issuing questionnaires to Internet platform companies. The research finds that both platform openness and plat‐ form attractiveness can positively promote the ambidextrous innovation of platform enterprises; meanwhile, plat‐ form openness and platform attractiveness can promote the ambidextrous innovation of platform enterprises through complementary assets, that is, the complementary assets play a role as the intermediary.