To solve the communication failure about intelligent watt-hour meter with non-polar communication solution.In this paper, the RS485 communication mode is introducted for the application of intelligent watt-hour meter, pointing out the improvement plan in principle between non-polar RS485 with the polar RS485.Combined with non-polar RS485 communication mode for the common fault of the intelligent watt-hour meter in field application situation, analysis of non-polar RS485 on the principle of design, and puts forward the solution.Ensure that work at the site of the intelligent watt-hour meter has Smooth transition between the original polarity interface RS485 to the manner of non-polar.