With the load property of two sides to the tide and wide range of load change,and also the DC component and harmonic component has been injected into the distributed power grid ,the adaptabilityof traditional metering device in the distributed power grid environment need to be researched .The following questions was respectively discussed in this paper,such as two sides and wide range measurement issues, the influence of the current transformer from DC components ,and the adaptability of harmonics measurement algorithm in the distributed power grid.