Lanxi County, which belongs to Suihua City of Heilongjiang Province, is located in the hinterland of Songnen Plain. Its geographical coordinates are 126°16 'east diameter and 46°15' north latitude. The total area of the county is 2499 square kilometers. As of midnight on November 1, 2020, the permanent population of Lanxi County is 308,684 people. Lanxi County is a subtropical monsoon climate. As of October 2021, Lanxi County has jurisdiction over 4 subdistricts, 9 towns, 6 townships and 3 township units. The county government is based in the town of Lancy.

There have been many primitive people in the Hulan River Valley in the past two or three thousand years. There are 202 National Highway, Suishao Road, Anlan Road, Suisuo Highway and Harbin Outer Ring Highway under construction in Lanxi County. It is a strategic transportation hub connecting east and west, connecting north and south and radiating the whole province in Songnen Plain. Lanxi County was selected into the list of the fourth batch of counties (districts) of the Ministry of Water Resources to reach the standard of water-saving society construction, the list of the whole county (city, district) roof distributed photovoltaic development pilot of the comprehensive Department of the National Energy Administration, and the national pilot county of agricultural socialization service innovation. The main tourist attractions in Lanxi County are: Xianyou Palace, Donglin Temple.
In 2020, the current GDP of Lanxi County reached 7.433.45 million yuan, an increase of 1.4 percent over the previous year.