According to the law of "Prevention and control of water pollution" and requisitions of emission licence system of water pollutants, combined with the realities of local water pollution In lake? the technical principle, work programme and calculation methods for water pollutant emission standards are put forward, i.e.(I) for uniformly mixed lakes, and (I) for nonun iformly mixed lakes.Some calculated examples in some typical lakes are further given for local lake management departments in making pollutant emission standards.