Abstract: The world suffers from air pollution from burning fossil fuels to produce energy. Cars consume a large proportion of fuel, especially spark ignition engines. The pollutants produced by these engines can be reduced using new types of alternative fuels, including hydrogen gas. Hydrogen is characterized by its high speed and high resistance to knock, making it an acceptable option for use in spark ignition engines. Among the disadvantages that prevent the use of hydrogen is its ease of ignition, safety requirements, lack of energy on the volume basis. In this study, we are trying to review a number of new researches which have tested practically and theoretically the use of hydrogen in ignition engines.