The disclosure provides a method of unlocking a vehicle door, including generating a dynamic password based on dynamic information by a vehicle chip, then generating a reference key based on the dynamic password, and storing the reference key in a storage medium; updating the dynamic password stored in a server, and according to the request of the mobile device, providing the dynamic password to the mobile device through the server, and the mobile device generating a mobile key according to the dynamic password. Finally, the reference key and the mobile key are compared, and if the dynamic passwords corresponding to the reference key and the mobile key are the same, the vehicle door corresponding to the vehicle chip is unlocked by the vehicle chip.