RMB exchange rate always attracts many countries` attentions. Based on different reasons, some countries hope RMB exchange rate increasing, but some countries urge China to devaluate it. Firstly, this article analyzes the factors causing RMB exchange rate to change. Secondly, it shows out both the good side and the bad side of increasing, devaluating or keeping the value RMB. Finally, it predicates the direction in which RMB exchange rate would change toward in future years later, and also suggests some countermeasures.