Songnen plain is the important plain in Northeast, China, and located in the middle part of the East Asian-Australasian Avian Migration Route which is the most key avian migration route of nine avian migration routes around the world. And this avian migration route possessed the biggest population number migratory birds and the most endangered avian species. Of them, Grey heron is a common bird species in Songnen Plain that is also an important habitat for the Grey heron. In order to understand the suitable distribution of Grey heron potential habitat in autumn, the potential habitat and its suitability distribution of Grey herons in Songnen Plain was analyzed by Maxent model and GPS/GSM satellite tracking technology, remote sensing, and Geographic Information System. The results showed that (1) the distance to water body and greenness index were the important environmental variables that affected the habitat suitability of Grey herons during autumn in Songnen Plain. (2) The suitable habitat area for Grey herons was 2761.06 km² (1.24% of Songnen plain area), mainly distributed in Daqing city (756.86 km², 27.41% of suitable habitat area), Baicheng city (537.14 km², 19.45% of suitable habitat area), Qiqihar city (439.43 km², 15.92% of suitable habitat area), and Buerbote Mongolian Nationality Autonomous County of Daqing city (429.90 km², 15.57% of suitable habitat area), Zhenlai county of Baicheng city (334.92 km², 12.13% of suitable habitat area), and Zhaoyuan county of Daqing city (185.54 km², 6.72% of suitable habitat area). (3) Among them, 15.79% of the suitable habitat areas were successively protected by Momoge nature reserve (10.34%), Zhalong nature reserve (3.47%), Xianghai nature reserve (0.67%), Chagan lake nature reserve (0.54%), Dabusu nature reserve (0.41%), and Wuyuer river nature reserve (0.36%). Based on the above research results, these habitats with small area for Grey heron should be paid more attention, and is maybe the most key habitat that can support habitat element for Grey heron.