Equal services, service performance, professional operation and reading promotion are the measurement standards of branch library service quality: equal services are guaranteed by service point coverage; the number of visits and loan books are the barometer of the branch library service performance; specialization is the guarantee for readers to effectively obtain resources and maximize service benefits; reading promotion is a comprehensive reflection of equal service, professional service and service benefits of the service system. The increase of service performance needs innovative input and incentive mechanisms to construct more service points. Long-term mechanism for reading promotion needs brand ideas and innovations of participating entities. Professional training and academic research can be used to improve the overall quality of the branch library.