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Blockchain as a Service is a new application method that embeds the blockchain framework into the cloud computingplatform,which can effectively use the cloud platform to improve the convenience and efficiency of the deployment and operation of the blockchain system.This paper mainly analyzes and summarizes the key techniques and existing platform systems of Blockchain as a Service.Firstly,this paper introduces the concept and function of BaaS platform,and analyzes the advantages of BaaS platform in improving safety performance,realizing personalized customization and reducing development cost.Then,based on the existing commercial BaaS platform,the system architecture and key technique architecture of BaaS platform are introduced in detail,and the characteristics,technologies and functions of the current mainstream BaaS platform,as well as the relevant application scenarios are introduced.In this paper,the challenges encountered by the current BaaS platform are summarized,and the future research direction of BaaS is prospected.