With significant increase of home appliances both in quantity and variety

the power harmonic contamination at residential area becomes more and more serious

causing a serious threat to the security and reliable power supply.Therefore

it will be of great importance in improving power supply quality of the residential area and assuring safe and reliable operation of power system.In this paper

takes the typical residential area as an example

analyzes the harmonic contamination of power supply presently at the residential area

compares and analyzes the harmonic control result by the active power filter at the area through increasing active power filters.It can be seen from the example of active power filter that the filter can simultaneously compensate for the different orders of harmonics

and have significant compensation result.