Abstract: Effect of land use pattern on dissolved organic carbon of purple paddy soil were investigated in a field experiment , which consisted of five treatment and had continued for 14 years at the farm of College of Resource and Environment of Southwest University. The results showed: in 0~30cm depth, content of dissolved organic carbon(DOC) range from 30.3 to 339.8 mg/kg, hot water dissolved organic carbon(HDOC) range from 60.9 to 740.2 mg/kg. both of DOC and HDOC decreased with increasing depth. DOC and HDOC in ridge, rice and rape use pattern in 0~30cm depth layer much more than other treatments after 14 years and showed significant differences；land use of rotation of waterlog rice and dry rape which was disadvantageous to increase the quantity of DOC, which indicated DOC is good evaluation index of soil quality land use effect for paddy soil. Land use pattern of ridge, rice and rape are best for improve the DOC of purple paddy soil.