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The vehicle navigation alarm system has played an important role in avoiding traffic accidents, but the function singleness, structure faultiness and price highness are open questions for the existing products. A new multifunction intelligent navigation alarm system based on ultrasonic ranging microprocessor SB5227 is developed to caution the driver with speech and LED for over acceleration, hard braking, up/downhill, backing, high-speed, bad weather, etc. This system has the characteristics of better practicability, higher reliability and higher cost performance. It can be used to prevent traffic accident effectively when combined with GPS.