RFID based PrePaid Car Parking System has application in many areas like Industries, Companies, Offices, Shopping malls. We have provided a DC motor and Relay to show the demo of valid security access. And a buzzer is provided which is turned on when an invalid RFID card is shown to the reader. Keypad is provided with this project. Keypad is used in recharge mode to add the balance in RFID card. Keypad is also used to select manual or normal mode. Infrared sensor is used to detect car.