The invention discloses an APP car rental booking method of a car rental
system based on the pre-estimated electric quantity. The method comprises the following steps that A) a user inputs a car using demand via an APP; B) a
server selects a
route according to the car using demand and a navigation
database and calculates the mileage of the
route; C) if cars whose pre-estimated electric quantity is enough to support the whole mileage exist, a
list of the cars is displayed to the user via the APP and a step D) is turned to, and otherwise, a step E) is turned to; D) the user selects a proper car and makes booking; E) the
server searches for transfer vehicle
renting points, the user selects a proper transfer vehicle
renting point, a step F) is turned, and if there are no transfer vehicle
renting points in the
route, the step A) is returned to, and the car using demand is modified; and F) the user selects a proper car and makes booking. Thus, the user can rent the car with sufficient electric quantity stably, and conditions of breaking down half way due to
electricity lack can be reduced. The method is suitable for all electromobile renting systems.