According to statistics, there are600million myopia patients in China, and the rate of juvenile myopia ranks first in theworld. The myopia rate of junior and senior high school students has exceeded70% and increases year by year, and the myopia rateof primary school students is also close to40%. There are many reasons for myopia, mainly long eye use time, incorrect eye posture,excessive use of intelligent devices and so on. How to reduce the incidence of juvenile myopia has become an urgent problem to besolved. In view of the bad habits existing in reading, this design uses STC89C51single chip microcomputer as the core control chip,uses ultrasonic ranging sensor for measuring distance, and uses LCD and buzzer for information display and alarm reminder. This pa-per introduces the overall structure, hardware circuit design and software program design of the system in detail, and realizes the ex-pected effect through simulation and physical object.