With the outbreak of the financial crisis，protests and riots have spread in many countries.As a powerful catalyst，the financial crisis led to social and political contradictions，which intensified and triggered protests and riots.In times of financial crisis，the decline of living standard，welfare cuts，rising unemployment，racial and ethnic tensions，corruption and partisan struggles were the major causes for the protests and riots.Although the protests and riots eventually subsided，the governments and international community were still on high alert because in times of financial crisis the protests and riots would possibly evolve into more serious social and political unrest if not properly handled.Therefore，how to deal with the riots and protests and prevent them from getting out of control has become a common concern for the international community.