The separation of Laurasia land and Gondwana land and the opening of the Atlantic Ocean as well as the extinction of the Palaeotethys Ocean in late Jurassic probably led to severe sea level change and climate fluctuation. Recent studies show that global climate was not always warm in late Jurassic. On the contrary, the world underwent a violent period of climate change, turning from cold wet to drought and hot during the Callovian-Oxfordian transition of the vast region of the west Tethys. In order to determine whether similar climate shifts might have happened in the East Tethys, the authors took the sediments from the Xiali Formation of Yanshiping Section in the Qiangtang Basin as the study object, measured CaCO_3,hematite and goethite, and analyzed lithologic changes with the purpose of summarizing the characteristics of the palaeoclimatic evolution. Some conclusions have been reached: Climate change in 163.8~159.6 Ma could be generally divided into three stages. The first stage(163.8~ 162 Ma)was probably humid, the second stage(162~ 161.4 Ma)might have been semiarid and the third stage(161.4 ~ 159.6 Ma)was characterized by aridification. It is thus held that the climate change at the late stage of the Middle Jurassic period (163.8 ?159.6 Ma) of the Qiangtang Basin in East Tethys responded to the Paleoclimatic evolution of West Tethys. In the light of climate evolution, the results achieved by the authors will help to evaluate the halite-forming potential at the late stage of the Middle Jurassic period.