Abstract: Based on the determination of morphological structure,moisture preservation content,wicking height,wicking rate,drying rate of Cooldry fiber,the properties of moisture absorbency and sweat transport of Cooldry filament were analyzed in this paper.The final result indicated that Cooldry is a profiled polyester fiber with microgrooves on its surface along fiber axis.For this reason,its wicking effect is improved significantly and therefore,the properties of moisture absorbency and sweat transport of Cooldry fabric are enhanced.