Abstract: Aiming at the shortcomings in the existing distribution automation systems, such as the use of feeder terminals and fault indicators, and other distribution terminals to achieve remote monitoring and fault location of line operation conditions, a new type of distribution line monitoring method based on the cloud is proposed. The computing technology has developed a small current ground fault monitoring system for distribution lines. The monitoring system integrates smart grid sensor, wireless communication and cloud computing technology application platform, making the distribution system transparent and visible, which can improve the economic and reliability of distribution network operation.