The diversity and faunal distribution of Lygus in Inner Mongolia were studied in the paper. The results showed that there were 12 species at present. In the Lygus fauna of Inner Mongolia, the composition of Palaearctic realm was dominant, 7 species distributed there, which accounts for 58.33% of the total known. In China, the main faunal composition of Lygus in Inner Mongolia was the member of Inner Mongolia and Xinjiang region, 2 species was known to be distributed there, accounting for 16.67%. Lygus were widely distributed in the zoogeographic regions of Inner Mongolia.