Scientific and technological(S&T)innovation policy is an important means to guide,encourage,and regulate S&T innovation activities.The level of S&T innovation in Yunnan is still in the third echelon of the country,and there is still an obvious gap with the construction goal of an innovative province,so there is an urgent need to improve the policy system for S&T innovation to provide a solid guarantee for S&T innovation activities.This paper reviews the text and content of Yunnan's S&T innovation policy,and uses the methods of longitudinal time comparison and entropy weight TOPSIS horizontal regional comparison to evaluate the implementation effect of Yunnan's S&T innovation policy.The results show that the construction of Yunnan's S&T innovation policy system has achieved remarkable results,and the policy implementation effect is in the top position of the western provinces,but there is still a big gap with the advanced provinces and cities in the west in terms of financial science and technology investment,high-level innovation platform construction,S&T talent training and introduction,transformation of S&T achievements and innovation environment creation.In view of the above problems,the paper puts forward some optimization suggestions from aspects like strengthening policy coordination,increasing factor investment,accelerating the transformation of achievements and optimizing the innovation environment.