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A hydrogen-fueled engine that had been redesigned based on SQR480EF engine was introduced, the hardware and software of electrical control unit was developed, and the experimental parameters optimization control of hydrogen-fueled engine was realized. According to the physics and chemistry characteristics of hydrogen fuel, the start control mechanism of hydrogen fuel engine was researched and start control strategy was established. In order to research start air-fuel ratio of hydrogen-fueled engine, the hydrogen injection quantity and air quantity were controlled. Meantime, through great deal of experiments, spark advance angles, ignition dwell angles, start injection width and electrical throttle threshold were optimally controlled. At last, quick response time of hydrogen-fueled engine was realized, speed stability after successful start was controlled. At the same time, backfire, preignition and fire a gun in the start state of hydrogen fueled engine were avoided.