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To study the power and emission characteristics of hydrogen internal combustion engine,an experimental study was carried out using a 2.0 L port fuel-injected(PFI)hydrogen internal combustion engine.Test results show the power of hydrogen internal combustion fell 40%comparing to the gasoline ; NOx emission concentration is always higher than 8000ppm when the equivalent fuel-air ratio is larger than 0.8 and lower than 500ppm when the equivalent fuel-air ratio is smaller than 0.5.NOx increases with the increase of the ignition advance angle.When the equivalent fuel-air ratio is larger than 0.5.The test results and the conclusions exhibit a guiding role on hydrogen internal combustion engine optimizations.