Abstract: During the maintenance of the heating pipe network of a power plant, the drainage, discharge and segmented isolation of the pipe network mostly need to work in a confined space such as the valve well.Confined space has always been a high incidence area for safety accidents with many operation risk points and high operation risks. Based on the actual situation of the heating pipe network of a power plant, several measures to reduce the operation risks in confined space of the heating pipe network are described so as to effectively ensure the safe and stable operation of the heating pipe network and reduce the incidence of accidents in confined space.