The invention provides an access method and system of communication service; the method comprises the following steps: receiving the service data access request satisfying the standard information format sent by the service system; detecting the legality of the information format of the service data access request; analyzing and storing the classification service data in the service data access request of the legal information format; sending the essential information of the analyzed classification service data. According to the data structure and alternate flow, the invention realizes the standard and automatically-finished parameter negotiable processes between the systems.