Grid-connection projects of 10kV distributed photovoltaic power generation have been widely spread, and most of them are still out of the control of the power dispatch center. Currently, distributed photovoltaic system islanding protection measures are still based on user side's inverter, therefore new islanding protection measures on grid side are needed to be studied. Based on the reform of grid-connected switchgear, closing and locking link and GPRS remote monitoring control system, the reverse power supply of 10 kV distributed photovoltaic power generation at grid connection point is effectively prevented.