Horqin Left Wing Rear Banner is located in the southeast of Tongliao City, Inner Mongolia Autonomous Region, between 121°30 '~ 123°42' east longitude and 42°40 '~ 43°42' north latitude. It borders on Shuangliao City of Jilin Province in the northeast; It is adjacent to Zhangwu, Kangping and Changtu counties in Liaoning Province in the east and south; The west and north are connected with Kulun Banner, Naiman Banner, Kailu County, Tongliao City and Kezuozhong Banner. It covers an area of 11,500 square kilometers. According to the seventh census data, as of midnight on November 1, 2020, the permanent population of Horqin Left Rear Banner was 321,438.

On April 18, 2019, the people's Government of Inner Mongolia Autonomous Region decided to withdraw Horqin Left Rear Banner from the poverty-stricken banner county sequence.

In July 2020, the National Association of Health Care decided to name Horqin Left Wing Rear Banner as the 2017-2019 cycle National Health County. In 2020, the annual GDP of Horqin Left Rear Banner reached 12.283 billion yuan