The Chalukou molybdenum polymetallic deposit, located in North Daxinganling District, is a super large scale porphyry deposit with resource of 1.34 Mt molybdenum, 370 kt zinc+lead and nearly 4 200 t silver. The resource has exceeded that of Jinduicheng molybdenum deposit and made it the largest scale molybdenum deposit in northern China. The result shows that geological setting, geological feature, petrological characteristics and hydrothermal alteration of Chalukou molybdenum deposit are similar to Climax molybdenum in West America, which is the product of extensional environment after collage of North China-Mongolia Block and Siberia Block in Late Mesozoic.