Abstract: In order to understand the content and seasonal dynamics of forest soil water-soluble organic carbon (WSOC) in the hilly region of northwest Zhejiang Province, the secondary forests and Chinese fir plantations were chosen as the test objects to study the WSOC content in 0-10 cm and 10-20 cm soil layers in four seasons. No significant differences were observed in the WSOC content in 0-10 cm and 10-20 cm soil layers between the secondary forests and Chinese fir plantations. The seasonal dynamics of soil WSOC in the secondary forests and Chinese fir plantations had the same trend, and followed the order of winter > spring > autumn > summer. The WSOC content in 0-10 cm and 10-20 cm soil layers in the secondary forests and Chinese fir plantations had significant negative correlations with soil temperature and precipitation, less correlation with soil moisture content, and positive correlation with litter biomass (especially for the WSOC content in 0-10 cm soil layer).