Many Times We Hear The Cases Of Bikes Getting Stolen From Parking Area Or Sometimes We Forgot To Remove The Keys From Bike By Mistake. In These Cases It Is Really Difficult To Get The Bike Back. This Project Is Designed To Solve This Purpose. Main Concept Behind This Project Is Of A Bike Security System Using A Password Entered Through Keypad. This System Turns On The Buzzer When Wrong Password Is Entered For 3 Times. User Can Change This Password Anytime He/she Wish Using A Keypad. It Uses Microcontroller: This Is The CPU (central Processing Unit) Of Our Project. This Project Has GSM Technology And Vehicle Anti-theft System With Vehicle Ignition Controlling Technique. Whenever Bike Owner Removes Key From The Ignition Lock At That System Is Turned On. We Have Provided Vibration Sensor With This Project, Which Is Similar To Piezoelectric Sensor. When Vibrations Are Detected, SMS Is Sent To The Owner Of The Bike. When Car Owner Sends Back SMS To Project Then The Engine Is Stopped. We Have Provided A Relay And A DC Motor To Show The Demo Of Vehicle Engine Controlling System