Abstract: It is very necessary to design and develop a set of distributed power grid interface integration device. The DARI-3317 distributed power grid interface device is designed and developed in the paper, and this device not only integrates the protection, measurement and control, the island, code conversion, telecontrol, power quality monitoring and information encryption, but also can communicate with scheduling master station to feedback real-time power station information, and accept the remote control to switch on or off the point of common coupling, and to start or stop the inverter. This device can realize real-time monitoring of the distributed power system. In addition, the soft and hard platform design of this device is with open interface and the extension of margin, facilitating future extension and technology upgrades, and ensuring more effective plant life cycle. The DARI-3317 distributed power grid interface device has been successfully applied in some distributed photovoltaic power station, which is validated by the practical engineering application.