Abstract: Thermal damage is one of the major disasters in deep mining, which seriously affects the psychological and physical health of miners. Large-scale mechanical cooling energy consumption is high and the investment is large. The cooling suit is an effective individual protective device applied in high temperature workplace. It is not widely used because of the problems of poor thermal protection time and poor thermal comfort. In this paper, a phase change cold storage material (PCCSM) filled cooling suit is designed. Numerical simulation method was used to study the thermal protection and wet diffusion characteristics of five types of cooling suits with distribution gaps of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm respectively in PCCSM package. Heat and moisture transmission were comprehensively analyzed. Through comprehensive analysis of heat transfer and moisture transfer, it is concluded that the 4 mm gap is the optimal distribution gap of PCCSM package, which can take into account the thermal protection of protective clothing and have a good effect on the moisture transfer.