This paper presents a novel "Roll and Raid" WebVR development model to solve the problems of conventional WebVR development practices. Firstly, agile methodology is introduced into the life cycle of developing WebVR. Secondly, some principles are further proposed to guide the entire WebVR development process. We choose some typical WebVR projects to verify its effectiveness. The experimental results show that our proposed "Roll and Raid" model is much advantageous over conventional WebVR development methods with lower cost, higher efficiency, stronger adaptiveness and easier team management.