After Rouhani’s coming into power，Iran took a moderate and pragmatic policy and advocated reconstructing Iran’s economy，creating a light social environment，improving the right of woman，and developing the relationship with other countries，which provide a significant basis for the nuclear agreement. The pragmatic policy under the presidency of Rouhani improves the international image of Iran and brings about an opportunity for Iran’s reintegrating the international community. However，Rouhani administration is still facing huge challenges which are mostly from Iran’s conservatives and from the pressure of relationship between Iran and U.S.