Abstract: To compare thermal comfort properties of fabrics with different structures in wet state,KES-F tester was used to test the thermal comfort properties of both knitted and woven polyester fabrics in wet state.The results showed that along with the moisture increases,fabric instant cool feeling enhances,thermal conductivity performance is improved and warmth retention property declined.When moisture content is the same,the instant cool feeling of knitted polyester is more prominent than woven polyester.The braiding method has no influence on the rule that thermal conductivity changes with moisture content.The warmth retention property differs little between the knitted and woven polyester fabrics in dry state.However,when wetted,their warmth retention property differs remarkably.In comparison,it is found that the knitted polyester fabric is advantageous over the woven polyester fabric in warmth retention property.