A stationary field experiment was conducted in an oasis along the Manas River, which is a typical inland river in the arid region of Northwest China to study effects of reclamation history of deserted salinized farmlands on labile organic carbon composition and aggregate stability of the soils. Results show that soil microbial biomass C (MBC) and soil labile carbon (LOC) decreased somewhat in content in the first years after the reclamation. And then soil organic carbon (SOC), especially MBC and LOC, increased in content and soil water soluble organic carbon (WSOC) and hot-water soluble organic carbon (HWSOC) in content and in proportion as well, in the years that followed. In the 1st, 5th, and 10th year after the reclamation, soil hot-water soluble organic carbon (HWSOC) in the field was 61.04%, 143.5% and 132.4%, respectively, higher than that in the control. After years of continuous cultivation, SOC and soil macroaggregate (＞0.25 mm) increased in content and the latter in stability, too. In the field 10 years old in reclamation history, soil aggregate (＞0.25 mm) accounted for 57.30% and 56.50%, respectively, in the 0~5 cm and 5~10 cm soil layer, but the aggregate index decreased to 43.00%. Correlation analysis shows that the content of soil water-stable aggregate (＞0.25 mm ) was significantly positively related to SOC and HWSOC and the contribution of the latter is significant to maintaining the stability of soil aggregates in salinized oasis farm fields in the arid region.