Abstract: By analyzing the characteristics of urban rail transit fully automatic operation （FAO）lines and the influence of which on the access control system, the key design contents of the access control system design (ACS) is expounded, that is to ensure the safety of personnel entering the FAO area. Compared with the traditional design schemes of the ACS, the key design points of which such as the FAO area division and protection, the ACS and automatic control with the related majors are discussed. On this basis, suggestions to improve the design scheme, such as adding monitoring objects in FAO area, improving safety grade, supplementing the requirements of automatic control with staff protection key switch (SPKS), synthesizing various identification devices and improving the management flow are put forward.