master Wang APP is designed for on-site service providers and engineers. A service provider who has signed a cooperation agreement with JD.COM can apply for registration of Master Wang APP, and use Master Wang APP to check the service progress of engineers under the service provider. Engineers can use Master Wang APP to take orders, make appointments, feedback service progress, promote services and extend warranty, and service providers can use Master Wang APP to take orders, make appointments, dispatch workers and check service progress. The platform has many orders, and supports intelligent reservation, prompt ring tone setting, face recognition punching, study examination of Jingjiang College, service promotion commission and other functions.