Dehui is a county-level city under the jurisdiction of Jilin Province and administered by Changchun City. It is located in the central and northern part of Jilin Province and the hinterland of Songliao Plain. It is located at 44°02 '~ 44°53' north latitude and 125°14 '~ 126°24' east longitude, with a maximum distance of 96 kilometers from north to south and 65 kilometers from east to west. East across the Songhua River and Fuyu City, Yushu City opposite; It borders Jiutai District in the southeast with Liutibian in the Qing Dynasty, Wukai River in the south, Changchun New District in the southwest, and Nongan County in the west and northwest except for Nongan Town and Qiangang Township in Nongan County, the rest of it faces Nongan County in the Yitong River. It covers an area of 3,322 square kilometers. As of 2018, Dehui Municipality has jurisdiction over 4 subdistricts, 12 towns and 4 townships. According to the seventh census data, as of midnight on November 1, 2020, the permanent population of Dehui city was 691,550.

In 2019, the GDP of Dehui was 23.48 billion yuan, down 3.8 percent from the previous year at constant prices.
Dehui is an important node city on the Beijing-Harbin Railway, a state-level advanced ecological demonstration city, and a provincial sanitary city in Jilin Province. It belongs to the north temperate continental monsoon subhumid climate zone, and its river is the Songhua River system. The terrain inclines from southwest to northeast, and the terrain is undulating.