In order to understand the effects of nitrogen deposition on carbon and nitrogen mineralization (C_min, N_min) in subtropical forest soils under global changes, and to elucidate the characteristics of soil C_min and N_min changes in dry and wet seasons and their relationships with soil environmental factors, four typical forest soils, namely, Quercus aquifolioides forest (GSL), Evergreen broad-leaf forest (CL), Pinus armandii forest (HSS) and Pinus yunnanensis forest (YNS), in subtropical Yunnan were studied, and four N-addition levels were set up: CK (0 g/(m²·a)), LN (10 g/(m²·a)), MN (20 g/(m²·a)), and HN (25 g/(m²·a)). PVC pipe soil was collected in dry season (November) and wet season (July) and brought back to the laboratory for 28 d incubation. The results showed that: 1) with the extension of incubation time, the average daily organic carbon mineralization of each forest stand showed an overall decreasing trend both in dry and wet seasons, while the cumulative mineralization increased gradually, but the rate of increase gradually slowed down. 2) Compared with CK, C_minwas inhibited by 18.34%-21.37% in GSL, and promoted by 23.95%-10.28% in YNS in the dry season under N addition; C_minwas inhibited by 14.97%-40.12% in CL, and by 41.14% in HN-YNS, while was promoted by 17.71% in LN-YNS in the wet season; In the two seasons MN inhibited C_minof HSS by 13.09% and 36.45%, respectively. 3) Under N addition, N_min was suppressed by 20.03%-95.31% in HSS, and promoted by 192.67%-658.92% in YNS in both seasons; N_min was promoted by 70.15%-259.07%) in CL in wet-season, and inhibited by 85.59% in CL-MN but promoted by 51.02% in LN-MN in dry season. Correlation analysis showed that N addition in dry and wet seasons mainly suppressed soil C_minand N_min by changing soil pH, inorganic N (NO₃^--N, NH₄⁺-N, etc.) contents, or nitrogen form in each forest stand, while it promoted soil C_min by increasing SOC content.