Abstract: Purpose/significance In order to prov ide enlightenment for the construction of the policy system of open science and open science infrastructure in China, this paper makes an in-depth analysis of the typical foreign policy systems of open science infrastructure.Method/process] Through online survey and literature research methods,this paper systematically investigates the policies of the European Union for implementing and operating the European Open Science Cloud(EOSC), and then summarizes the hierarchical structure, content characteristics and formulation strategies of the EOSC policy system. [Result/conclusion] It is suggested that China should form a three- -level policy system structure with national strategy as the leader, relevant policies as the environmental guarantee, and the rules of open science infrastructure project guidelines as the specific operational requirements as soon as possible; establish a decision support organization system and optimize the decision workflow; strengthen international cooperation and integrate into global govermance.