The inadequacy of internal combustion engines using diesel fuel to meet emission standards has made it necessary to make radical innovations in these engines. With the use of hydrogen-diesel dual fuel mode, it is possible to increase the performance of these engines and reduce their emissions. However, there are many obstacles to the use of dual fuels. The most important of these obstacles is the decrease in the volumetric efficiency with the increase of the hydrogen energy ratio. To solve this problem, more air must be taken into the cylinder at the suction stroke. In this study, the effects of hydrogen energy ratio and intake valve lift amount on performance and emissions in hydrogen-diesel dual fuel mode were experimentally investigated. Experiments; constant speed (1850 rpm), different load (3, 4.5, 6, 7.5, 9 Nm), different hydrogen energy ratios (7, 9, 11, 13, 15) and made in different intake valve lift (4.0, 4.46, 4.9 mm) amounts. Compared to pure diesel and standard valve lift at 9 Nm load, 40% reduction in soot emissions and 33% reduction in CO emissions was determined when the hydrogen energy ratio was adjusted to 7% and the valve lift amount was increased by 10%.