Abstract: Network harmonic of power network is one of the important factors of power quality.If it exceeds standards and is not treated in time,would affect the power quality.According to test,analysis,calculation and the actual situation,we adopt suitable treating equipments and technology to improve the power quality and the running reliability of electrical equipments.Base on the description of the harm of the harmonic,the types of harmonic resources and the harmonic treatment technology,this paper make suggestions on harmonic treatments.