A simulation model of the homogeneous charge compression ignition (HCCI) internal combustion engine was created using the CHEMKIN software to analyze and study the effects of various parameters, such as hydrogen doping ratio (α), inlet temperature, and equivalence ratio (φ), on the combustion performance of the internal combustion engine, focusing on the internal combustion engine in-cylinder temperature and pressure, as well as the exothermic rate and NO emission. The results reveal that when α and inlet temperature increase, so do the in-cylinder temperature, pressure, and exothermic rate, and the ignition moment advances; When φ is 1, the peak values of in-cylinder temperature, pressure, and exothermic rate are at their maximum, and the ignition moment advances with the decrease of φ; the generation of in-cylinder NO is less affected by α, and the peak value of the in-cylinder NO mole fraction rises with the increase of α; and the NO emission is greatly reduced with the end of in-cylinder combustion. The increase in α from 0 to 0.2 considerably reduces NO emission, although the main primordial reaction species of NO remains unchanged, the total reaction rate increases, and the NO in the cylinder primarily comes from HNO, while NH primarily consumes NO. A feasibility study is provided for the improvement of combustion and emission performance of future ammonia-hydrogen HCCI engines.