[en] The methods and results of the investigation on natural penetrating radiation level in Changchun Province are presented. 300 25 km x 25 km-grid measuring points were set up uniformly all over the province, with 324 densely measuring points of different types added. The results show that: (1) The area-weighted, population-weighted and point-weighted average values of natural γ radiation dose rate for field are 54.5, 58.1 and 55.7 nGy·^-1, respectively; (2) The point-weighted average values of natural γ dose rate for road are 57.6 nGy·^-1; (3) The population-weighted and point-weighted average values of natural γ radiation dose rate inside building are 94.4 and 92.2 nGy·h^-1, respectively; (4) The point-weighted and population-weighted average values of the dose rate inside building from cosmic ray are 29.2 and 28.3 nGy·h^-1, and outside buildings are 32.8 and 32.3 nGy·h^-1, respectively; (5) The point-weighted and population-weighted average values of natural penetrating radiation dose rate inside buildings are 122.1 and 122.7 nGy·h^-1, outside buildings are 88.5 and 90.4 nGy·h^-1, respectively; (6) The annual effective dose equivalents from cosmic ray, natural γ radiation and natural penetrating radiation are 0.26, 0.51 and 0.77 mSv, respectively; and correspondingly, the annual collective effective dose equivalents are 0.6, 1.2 and 1.8 x 10⁴ man·Sv, respectively