Before the independence of Myanmar, the British colonists took advantage of ethnic contradictions to provoke ethnic relations and implemented the colonial rule of "dividing the Yi and governing the Yi",Therefore, the disputes and fighting between the Wa tribes in northern Myanmar were constant, and the tribes were in a state of division.According to incomplete statistics, before the independence of Myanmar, there were more than 60 Wa tribes in northern Myanmar.During the British colonization, the British also introduced the poppy, known as the "flower of sin", to the Wa State.In 1825, Britain took the opium poppy to northern Burma; in 1866, it was spread to most of Burma.Because Wa state is located in the alpine mountains, with complex terrain, high mountains and dense forests, and large altitude differences, it is easy to form a unique three-dimensional climate and animal and plant distribution characteristics. In addition, it is in the subtropical climate area, the high temperature a