It is of importance to reconstruct the paleoclimatic variations since late Pleistocene in North China.In this paper,it selected Ningjinpo area to characterize the paleoclimatic oscillations with the aid of microbial lipids.Results indicate that the carbon number distributions of most samples ranged from C15to C33,with the dominance of high carbon(C29and C31in particular) in most samples and some lower homologue as secondary peak(C17for instance),suggesting the mixed origin from higher plants and aquatic organisms.According to the parameters derived fromn-alkanes,alternative paleoclimatic conditions of the study area from warm climate with low lake level(83-68ka),hot-wet period with lake expansion(68-30ka),colddry duration with shrinking lake(30-22ka),hot and wet climate with increasing lake level(22-10ka),to moderate climate period(10-0ka)were reconstructed since late Pleistocene.Regional comparison demonstrated the similar glacial-interglacial paleoclimatic patterns occurred in Ningjinpo area and Yanqing basin,potentially suggesting the principal control of solar radiation.