I. Ore deposit geochemistry research（1982.3-1986.4） 　　During his MSc study in the Institute of Geochemistry, Chinese Academy of Sciences, he carried out systematic research in the geochemical processes responsible for the formation of the Yingdonggou Ag-Pb-Zu sulfide ore deposit, which is located in northwest of Hubei Province. His research work involved geochemical study of mineral inclusions, isotopic composition study for tracing geochemical processes and the source of ore-forming elements, and mineralogical composition measurements. II. Geochemical research of Cenozoic basalts and their captured xenoliths（1986.5-1991.3） 　　During his PhD study in University of Tokyo, he measured a lot of basalt and xenolith samples for abundances and compositions of major and trace element as well as their Sr, Nd, Ce isotopes, so as to understand the geochemical composition of the continental mantle beneath China and the geochemical processes for the geochemical heterogeneities of the mantle. III. Geochemical research of loess and desert deposits in northwest China（1991.4-1994.3） 　　This research focuses on the mineralogical, chemical, and isotopic (Sr, Nd, Ce, Pb) compositions of the loess and sand samples collected from Tarim Basin and the central loess plateau. It helps to understand the provenance areas where the loess deposits came from and the geochemical and sedimentary processes to change the mineralogical and chemical compositions of the deposits, which is crucial to understand the loess formation and even the evolution of continental crust.