Abstract: The Mantang River was a typical black and odorous water body in Shenyang City, and a typical seasonal river in Northeast China. Its water quality directly affects the life of residents on both sides of the river and also affects the water quality of the Hunhe River. In recent years, the pollution problems of the Mantang River had been basically solved, the water quality and water environment had been significantly improved through comprehensive measures such as control of the pollution sources, interception of pollution, treatment of endogenous pollution, ecological restoration and long-term management measures. Taking the Mantang River as an example, on the basis of analyzing the sources of main pollutants and existing problems, the overall treatment scheme, targets and measures of the Mantang River were mainly introduced. Then, the typical treatment technologies and experiences of the black and odorous water body of the Mantang River were summarized. In addition, the results of the Mantang River before and after treatment were comprehensively compared in order to provide reference for the treatment of black and odorous water bodies in northeast China.