Abstract: In view of the current situation of smart grid development,this paper analyzes the difficulties in the construction of smart grid,and puts forward that the ultra-reliable and low-delay characteristics of URLLC technology can reduce the delay of smart grid,increase its reliability,and provide support for the construction of UHV grid.In addition,by analyzing the channel polarization of polar coding and comparing with other coding methods,a more suitable decoding method for polar coding in smart grid,namely distributed CRC-Polar code,is summarized.This scheme can not only reduce the downlink channel delay of power grid,but also increase the reliability of URLLC technology,which has certain reference value.