The online service of Didi Master means that the driver master of Didi Platform accesses Didi Platform and can accept taxi orders from passengers. After the driver of Didi Platform completes the registration and passes the assessment, he needs to take orders online. Didi driver opens the application for logging into Didi owner, chooses to join with a car, uploads relevant information and completes registration. After the registration is completed, the driver's master can start taking orders. In some cases, Didi will ask the driver's master to conduct online training and be familiar with the order-taking process and the operation and use of the software. After the training is completed, the driver's master can start taking orders. They will choose whether to take the order according to the starting and ending position information of the order and their own vehicle position information. When they choose to take an order, they need to confirm the starting and ending position information of the order and set their own service attitude and other information. During the online period, the driver's master needs to stay online so that passengers can contact at any time. The long-term offline of the driver's master will affect the passenger's experience of calling a car and lead to complaints from passengers. In addition, the Didi platform will also be evaluated according to the service quality of the driver's master and the completion of the order to ensure the passenger's travel experience.