In March 2015，Saudi Arabia led a coalition to launch “Operation Decisive Storm” against Huthi militia，with the stated goal of rolling back Huthi advances and reinstating the Hadi government. The involvement of external actors has turned a internal power struggle into a regional power contest，and framed two main warring factions：the Huthi-Saleh bloc and the anti-Huthi bloc. Nearly a year on，the war has had three phases：the Huthi advances were obstructed，the anti-Huthi bloc launched a counterattack，the conflict were a bloody stalemate. The war not only brought severe humanitarian crisis，social division and economic collapse in Yemen，but also impacted the power balance of the Gulf and regional security and stability. In March 2016，some signals brings a ray of hope to resolve the conflict in Yemen. However，there is a long way to achieve the ultimate peace.