Firstly，develops theory analyses on the inherent relevance between producer services and urban service function. Secondly，taking the perspective of producer services is important carriers of service function of center city as thread，analyses service function of Beijing and compares with the service function of Shanghai and Hong Kong. The study results as follows. The service function of Beijing characters notably as controlling and administering，and innovating function，while the service function of Shanghai and Hong Kong are mainly circulating marketing center，financial center and business servicing center arising from regional economic center under the function of marketing mechanism. Beijing，Shanghai and Hong Kong should mutually constitute the strategic service engine for industrial upgrading in China in complementation and lead the national value chain.