Abstract: It is often feasible to study paleoclimate by sedimentology means.Its advan tage is that a continual sequence of climate changes can be established without limited by the lack of fossils,etc.However,it must be noted that the method of synthetic analysis should be used and also that some special and efficient methods should be chosen according to specified geologic and geomorphic conditions; not all methods are good for use.For instance,in a limestone area the change of content of calcium carbonate in dispersive state is relating to the bedrock rather than dipending on the climate during deposition.Conversely,when cllcium carbonate is present in cemented state,the degree of weathering and recrystallizing of the calcium Carbonate itself as well as the volume and size of the fragmentary limestone in the deposits,and whether they themselves to be solute or cemented, all these can reflect definite climate environment. From results of various analysis for sediments accumulated in the cave of “Peking Man”,(i.e.the existing state of the calcium carbonate,the clay mineral composition,the index of geochemic,the degree of surface corrosion of quartz sand and the mineral characteristics of the debris in the sediments) six different climate stages can be divided for the period of 800,000 Y.B.P.-230,000 Y.B.P,. and they can fully reflect the changes between cold and warm as well as between arid and humid conditions.Besides,this shows that the monsoon climate had been formed in East China in Mid-Pleistocene.And the climate during pleistocene period in North China roughly corresponds to the present climate in the Huaiho River basin,and sometimes corresponds to the warm temperate zone climate in the Yangtze River basin. The general tendency of the climate change during Mid-Pleistocene was changing from semi-humid warm temperate climate to semi-arid temperate climate. There is not arty trace of glaciation to be found from the analytical results of all sediment samples collecting from the whole stratigraphy section in the cave of “Peking Man”.