The Red Coat Army was an armed group between Shandong and Huaihai regions between the Jin and Yuan Dynasties. It had a certain degree of influence on the three historical regimes of Song, Jin and Yuan and the future development of Chinese history. Yang An Er is the first leader of the Red Coat Army. He is a local leader with a handicraft industry as his main source of livelihood. He served as an official of the Jin Dynasty. He had to fight with the Mongolian army after the battle in the hui he castle, after the defeat, he fled back to Shandong and activities in Yidu. In 1214, he arrived in Jiaodong Peninsula, his influence expanded rapidly, and the establishment of Tianshun regime. But it was eventually destroyed by the army of the Jin dynasty. His core group is young's clan, Shandong hero and tie wa Gan Zhan army, members of the social class is quite complex, not simply the peasant uprising army. He was not loyal to the Song Dynasty, the Song Dynasty was only a tool for him against the Jin dynasty.