Emerging economy multinational enterprises(MNEs)not only need to face institutional difference between home and host countries,but also between different host countries.Under the background that China is in a critical stage of high-quality economic devel-opment and transformation,it is of great significance to understand the effect of institutional complexity on MNEs'innovation perform-ance from the institutional logics perspective.Based on the data of Chinese A-share listed companies from 2007 to 2017,this paper ex-amines the relationship between institutional complexity of host countries and MNEs'innovation performance.Our findings suggest that institutional complexity has a significantly positive impact on MNEs'innovation performance,which is reflected in the increase of the number of patent applications.In addition,we find that the institutional constraints from home country and MNEs'international experi-ence positively moderate the institutional complexity-innovation relationship.Moreover,our results show that institutional complexity pro-motes MNEs'innovation performance by improving their absorptive capacity.This paper not only confirms the positive effect of institu-tional complexity on MNEs'innovation performance,thus providing new empirical evidence for MNEs'strategic responses to institutional complexity,but also has important policy implications for the implementation of innovation-driven development strategy.