In order to study the effects of soil freezing and thawing process on carbon and nitrogen turnover in spring, the contents of microbial biomass carbon (MC), microbial biomass nitrogen (MN), soluble organic carbon (DOC) and nitrogen (DON) in two kinds of forest soil in Changbai Mountain area during spring thawing were measured and analyzed through continuous sampling in situ culture. The results showed that: during the soil thawing process, the temporal variations of MC and MN were different in the two types of soil, moreover the MC and MN showed obvious vertical spatial heterogeneity, and MN content in 0 - 10 cm soil layer was significantly higher than that in 10 - 20 cm soil layer. Except for individual periods, MC content in 0 - 10 cm soil layer was also significantly higher than that in 10 - 20 cm soil layer. During thawing process, the DOC content dynamics in 0 - 10 cm soil layers were basically the same in two types of soil, but the maximum DOC release in 10 - 20 cm soil layer presented earlier in Korean pine broad-leaved forest than that in Secondary birch forest. The DOC releases of the two forest types were both concentrated in the middle and late stages of thawing. During the thawing period, the temporal dynamic changes of DON in two forest types were consistent, and the maximum DON release occurred in the late stage of thawing. There were obvious vertical spatial distribution characteristics for DON content in two forest types during thawing period, and the content of DON in 0 - 10 cm soil layer was significantly higher than that in 10 - 20 cm layer.