Current sensor can measure DC current signal for high frequency (MHz magnitude), which has a very wide frequency range. And its affluent magneto resistance system can meet the needs of all kinds of electric current in the power system monitoring. In this paper, the former measure the performance levels of the network through objective point of view, the latter base on the former to join the subjective demand of distribution communication service, and to compromise subjective and objective decision result which make the business’s decision for choice of network access result more reasonable and more In favor the meet business needs of Cos.