The rational selection of cooling clothing and its material to guarantee the life of workers in tunnel with high temperature and humidity is of great importance. As a result, the influence of high temperature and humidity environment on physiological index and comfort of human is analyzed; and then the developing situation of the cooling clothing in China and other countries is investigated according to related hygienic standards; finally, experiment is carried out for phase change material. The results show that the phase change material cooling clothing is feasible for high temperature and humidity tunnel environment, and some improvement methods for phase change material are put forward.