Taipingchuan Mo mining area locates at Manzhouli-Moerdaoga section(middle) of Ergun metallogenetic belt which is northern to Greater Khingan Mountains. The analysis on rocks in the mining area suggests that granite-porphyry in the area is slightly peraluminous, high-K and subalkalic, and porphyritic granite is metaluminous, high-K and subalkalic, and granodiorite is metaluminous, high-K and subalkalic. The study provides geological and geochemical evidences for prospection in the future.