This paper aims at estimating the potential of Electric Vehicles (EVs) to assist the integration of wind power generation into the power system. Firstly, the potential of EVs to provide regulating and operating reserve power is investigated. Secondly, EVs' potential as energy storage system is considered. A real time electricity price signal which depends on the fluctuating wind power generation is used to provide incentives for EVs charging. The case of Shenzhen city which is expected to be a forerunner of massive EVs deployment in China is preliminarily studied to estimate the potential of EVs under 2050 scenario assuming 17% wind penetration. Result shows that about 15.25% of plugged EVs could meet the increased regulating reserve need, and 46.70% could satisfy the increased operating reserve need when 50% of EVs is plugged into grid at the same moment. In addition, EVs have the potential to provide back-up power for wind shortage and absorb the excess wind power as energy storage system.