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This paper studied suitable methods to use reformed gas (H2 67% and CO 33% mixed), hydrogen as alternative fuels for an internal combustion engine. Both the internal mixture formation and the external mixture formation were studied. PIMGI (Port and Intake Manifold Gas Injection) engine of the external mixture formation was equipped with two electro-magnetic injectors per cylinder. One injector was installed in the intake manifold for the homogeneous mixture and the other was installed near intake port for stratified charge. The fuel pressure for PIMGI was 0.8 MPa. In GDIC (Gas Direct Injection into Cylinder) engine of the internal mixture formation, the gas injector driven by the hydraulic pressure was installed in the cylinder head. The fuel pressure for GDIC was 5.0 MPa. In the GDIC, the fuel was injected early after intake valve was closed because the gas pressure was relatively low for direct injection.