This paper is mainly focused on the structure characteristics and the flaws of existing studies of CRC+AC composite pavement, mechanics theory and finite element method are applied to establish CRC+AC composite pavement finite element models based on crack pattern, the critical load position of CRC+AC composite pavement is found out under different crack spacing, and cracks on the AC layer extended mechanisms have been studied. The results show that: critical load position may appear in the horizontal cracks in the middle of the edge and vertical of the central free edge;in the long-term effec...