【Purposes】 To quantify the effects of asphalt concrete (AC) layer thickness and continuously reinforced concrete (CRC) slab micro-crack width on the mechanical responses of CRC+AC composite pavement, and to propose a reinforcement ratio optimization design method that accounts for the influence of AC layer thickness. 【Methods】 A three-dimensional finite element model of CRC+AC pavement was established and validated against field-measured data. Based on the critical control value of the maximum p