Ruili, a county-level city under the jurisdiction of Dehong Dai and Jingpo Autonomous Prefecture in Yunnan Province, was formerly known as "Mengmao". Located in the western part of Yunnan Province, Ruili is the birthplace of Dai culture, an important port city on the southwestern border of China, and also one of the regions with the earliest history, the best foundation and the highest degree of openness on the southwestern border of China. As of September 2022, Ruili has a land area of 944.75 square kilometers. In 2021, there will be 226639 permanent residents in Ruili; The minority nationalities are mainly Dai, Jingpo, Deang, Lisu and Achang. The government is located in Mengmao Street.

Ruili is the only border trade zone with special management in accordance with the "inside and outside the customs" model in China, the largest inland port in southwest China, an important jewelry distribution center, and one of the first batch of excellent tourism cities in China. Ruili is also one of the 17 international dry port cities in China and the first stop of the Myanmar-China oil and gas pipeline entering China. On December 7, 2016, Ruili was listed as the third batch of national comprehensive pilot areas for new urbanization. 2019 China's top 100 tourism counties and cities.

In 2020, Ruili achieved a GDP of 16.702 billion yuan, an increase of 8.1%.