To conduct research on BRICS countries, one needs to draw more attention to the means of promoting their mutual trust and co-maintaining a multilateral trade system, in the meantime, one shall not alienate the WTO and the UN. The BRICS countries should co-operate with more inclusiveness and be ready to join hands with other developing countries. The five countries` co-operation could gain more speaking right and play a crucial role in enlarging the impact of emerging economies and developing countries.