Kaolinite is dominant in clay mineral components of the relic paleo-soil on various rock in Zhoukoudian-area, which is accompanied by the hematite. Therefore, relic paleo-soil are considered as red earth type, that had been developed under the condition of wet-hot climate. Maybe the formation of relic. paleo-soil started in Pliocene. Clay mineral components in the middle portion of upper gravel layer and the 15-th layer in Pekipg Man,cave deposit at Longgushan, Zhoukoudian are composed of Kaolinites and illites. They also had been developed under wet-hot climate, but the wet-hot degree was slightly lowor than the wet-hot degree under which palesoil of red earth type was developed. Lower gravel layer of Longgushan and the devposits of the 14-th layer in-Peking Man Cave might be formed at the same geologic age. Based on the assumption that,clay mineral components are responsive to paleoclimate conditions, it may be concluded that during 300-500 thousand years when Peking Man lived in Zhonkoiidian, the paleoclimate had been gone through multiple fluctuations, but the general trend of the climateic conditions was changed from warm-temperate to temperate.