In the era of technology, most car washing companies do not have a reservation management system to effectively manage customer reservations. The customer's reservation needs to be made by telephone or in the store, while the car wash company records the reservation using paper for physical storage, which will lead to the possibility of error and low efficiency. In addition, the emergence of reservation management system brooks no delay. The goal of the car washing reservation management system is to improve the efficiency of the car wash reservation management system and improve the membership system. The methodology used by the car wash reservation management system is the waterfall model, which enables the construction system to be implemented efficiently. Finally, the car washing reservation management system will improve the management efficiency of the car washing company and promote the reservation process of the members.