Based on the data of China's Ashare listed companies,this paper analyzes the effect,mechanism and heterogeneity of the policy pinpointing “houses are for living in,not for speculation” on corporate innovation with differenceindifference method The results show that:the implementation of the policy significantly promotes corporate innovation,but this effect is only significant in supplyside regulatory policies Mechanism analysis shows that the innovative effect of the policy is mainly achieved through reducing real estate investment,improving R&D capital investment,enhancing slack resource pool and promoting output efficiency,which further promotes companies TFP Heterogeneity analysis finds that the effect of the policy on corporate innovation is different in different corporate characteristics,in different industry characteristics,and in different external environments