Through the online questionnaire survey of 338 science and technology museums that have received free opening subsidy funds by the end of 2021 and the field investigation of some science and technology museums，we have a comprehensive grasp of the allocation，use，system construction，performance evaluation and supervision，and the effect of the policy about the national free open science and technology museums. The research results show that all regions highlight the importance of the free opening of science and technology museums，constantly strengthening institutional construction，and providing different levels of financial support. At the same time，they suggest that the supervising department should clarify the scope of expenditure of subsidy funds，take the exhibition and education area of science and technology museums and the annual audience number as the basic allocation factors of free opening subsidy funds，and appropriately consider the regional financial difficulties and performance evaluation results when allocating funds. Based on the above research results，this article puts forward some relevant suggestions for the clarification of the scope of free opening subsidy funds expenditure，the adoption of factor method for fund allocation，the encouragement of the construction of distinctive exhibits and exhibitions，and the strengthening of performance evaluation and supervision and management，which provides strong support for the drafting and promulgation of the“Management Measures for Free Open Science and Technology Museum Subsidy Funds”.