Based on loss on ignition of different parts of Heqing sedimenl cores, we studied ihe chararterislics of orbital scale evolulion of the lake paleoproduetivily by using Spectral analysis and Filler methods, ll shows thal obliquity cycle is stronger than precession clcle in the 2. 78 Ma, due to differenl phasing relalionship helween suminer insolation in ihe norlhern hemisphere and latent heat export in ihe sou I hern Hemisphere. 15 ka, 10.7 ka and 10 ka are the relatively stronger cycles from 987 ka to 1552 ka, in which 10 ka and 10. 7 ka are semi-preression t v-cles related lo the strengthened 100 ka cycles. Further, ihere is Mid-PIeislocene Revolution coincidenl wilh flimat-itc changes in the evolution of lake paleoproductivity.