Abstract: In order to better evaluate the operation effect of sewage treatment plant in Songming County, Yunnan, the author investigated and analyzed the water and sludge disposal from sewage treatment plant of Songming County in Yunnan running for one year. The results showed that: the removal rates of BOD, CODcr, SS, TP and NH4-N from the sewage treatment plant were 81.45%, 78.78%, 86.08%, 41.37%, 84.03%, respectively. The sludge disposal from this sewage treatment plant was according with environmental protection and agricultural requirements, and did not cause environment pollution. In addition, the stench problems of the sewage treatment plant were also effectively control. The results had a directive and practical importance for the design and late running of the sewage treatment plant.