Abstract: For improving wear-comfort of the wool fabric in high temperature environment and exploit its serviceability field, this paper discusses the coolness property of the wool and chief methods for further improvement of the coolness and comfortableness of the wool fabric. Because of its excellent hydroscopic property, the wool fabric feels cooler than polyester and facilitates the development of air conditioning product. Along with the development of textile technology, there are many approaches for realizing this goal. Besides the previous wool scale peeling-off method, they include functional finish, slenderizing of wool, compound weave, and so on. The development of cool wool fabric is beneficial to designing and manufacturing the high-end summer apparel wool fabric which is thin and light, breathable and feels cool. It is a feasible and meaningful practice which will surely promote the development of the wool textile industry.