Abstract: The soil dissolved organic carbon (DOC) is an important component of soil organic carbon (SOC) pool. Exploring the variations of SOC, DOC contents and the proportions of DOC to SOC under different land use types is of great significance to deeply understand the turnover and sustainable management of SOC. The DOC content data of surface soil (0-20 cm) under the three land use types, including cropland, forestland and grassland, were collected and extracted from published studies conducted in China from 2000 to 2024. A total of 116 target literature were obtained, yielding 549 matched data sets. A quantitative analysis was conducted to determine the impact of different land use types, climate zones and soil types on DOC content under different climate regions and soil types, as well as the relationship between SOC and DOC. The results showed there was a significant difference in the contents of SOC and DOC under the three land use types. The SOC and DOC contents under forestland were higher than those in grassland and cropland. In different climatic regions, there was a significant positive correlation between DOC and SOC under the three land use types (P<0.01), and the proportion of DOC was different. In subtropical monsoon climate region, the mean value of DOC proportion in forestland soil was 2.30%, which was significantly higher than that in cropland (0.87%) and grassland (0.66%, P<0.05); in temperate monsoon climate region, there was no significant difference in DOC proportion (P>0.05) under the three land use types, including forestland (1.27%) > cropland (1.18%) > grassland (1.03%); in temperate continental climate region, DOC proportion in cropland, forestland and grassland soil was 1.76%,1.43% and 1.28%, respectively, but there was no significant difference (P>0.05). The DOC proportion in different soil types of croplands is significantly different. Among them, the DOC proportion in cinnamon soil was the highest, and the mean value was 1.61%, followed by gray desert soil (1.38%), black soil (1.10%), red soil (0.99%) and fluvo-aquic soil (0.89%), while paddy soil was the lowest (0.74%). The research has important implications for revealing DOC changes and providing important theoretical significance for the management of DOC under different land use practices.