Jingpohu volcanic field is an important window for the study of intra-continental Cenozoic basalts. Previous studies on Xingshan volcanic group located in the southeast of this area have rarely been conducted and the possibility of magma assimilation and mixing in this area has been denied. The basalts of Xingshan volcanic group have been systematically studied in terms of petrology, petrochemistry and Sr-Nd-Pb isotopes. It is believed that the basalts of Xingshan volcanic group are mainl alkali basalts and trachytic basalts. The fractionation of olivine and clinopyroxene occurred during the ascent of the primary magma, and the assimilation and mixing occurred in the upper crust, with weak AFC effect. The comparison between the basalts of Xingshan volcanic group and the Jingbohu basalts shows that the alkalic basalts in both areas are derived from the partial melting of garnet peridotite, and the partial melting degree of Xingshan volcanic group is slightly lower than that of Jingbohu basalts. In terms of magmatic source region, the Xingshan volcanic group is the mixed source of PREMA and BSE end-member, while the Jingbohu basalts are the mixed source of EMII and BSE end-member at the same period. The heterogeneity of magmatic source region and the difference of magmatic evolution are the main factors causing the difference.