Sectarian conflicts continued in the Arab world in 2017. The most prominent was the severing of relationship of two Sunni countries，Saudi Arabia and Qatar，which has resulted in a divisive trend within Sunnis as well as a chain reaction at the regional and international levels. The severing of relationship of the two countries reflects the continuing game between the United States，Russia，Iran，Turkey and other countries in the Arab world. The sectarian issue has become a tool of political struggle.