Based on the pressure of China's economic transformation and the steady development of opening up in the context of the "new normal", it is examined how increasing OFDI affects the misallocation. This paper systematically sorts out the theoretical mechanism of OFDI to improve the efficiency of enterprise allocation from the aspects of reducing excess capacity effect and industrial structure upgrading effect. The data of China micro-enterprise and the PSM-DID model is used for empirical test. It is found that OFDI significantly alleviates the misallocation. After replacing different misallocation indicators, the results are still robust. The heterogeneity test shows that OFDI in high-income countries and trade-sales and diversified enterprises the mitigation effect of mismatches is more pronounced. Under the background of frequent trade frictions in the international market, the research conclusions have guiding significance for how China can use the opening-up strategy to achieve optimal allocation of elements.