Against the backdrop of developed countries recovering slowly and emerging powers slowing down significantly in 2015’s world economy，policies pursued by great powers towards Africa followed the basic logic of building comparative advantages and struggling for superiority in Africa，which was also the key characteristics of great powers’ Africa policy in previous years. Almost all evidences show that there is a potential great reversion arising in terms of engagements of traditional （West） and emerging powers （East） with Africa，including for example，“West dominance and East subordination” in global development agenda setting，“West strong and East weak” in peace and security cooperation with Africa，and “West rising and East falling” in cooperation mechanisms building with Africa. In other words，while traditional powers have been rebuilding their strengths in Africa for the past years，emerging powers are losing their momentum and facing challenges of sustainability when engaging with Africa. Given the fact that China-Africa cooperation is keeping growing in the grand context，both opportunities and challenges for trilateral cooperation in Africa are increasing.