Abstract: An experimental research of cylinder balance control was carried out to address the multi-cylinder imbalance problem of a marine micro-pilot-ignition dual-fuel engine. The engine simulation model was established and verified by the measured intake manifold pressure,and the quantitative analysis of cylinder-to-cylinder variation of the natural gas（NG）quantity and the excess air ratio was conducted with the simulation model. The experimental study of cylinder balance control with the NG quantity compensation method was then carried out. The peak in-cylinder pressure pmax,IMEP and exhaust temperature of each cylinder were used as control variables to correct the NG injection pulse width of each cylinder respectively. Experimental study shows that the maximum difference of the NG injection quantity between cylinders is 2.76%. When each cylinder balance control mode is used,the relative deviation of the corresponding control variables is effectively reduced. In detail,the pmax unevenness coefficient is less than 1.2% in the pmax control mode,the IMEP unevenness coefficient is less than 0.8% in the IMEP control mode,and the difference of exhaust temperature between cylinders in exhaust temperature control mode is controlled within 11℃. Furthermore,the IMEP control mode is activated at low to medium loads to reduce the risk of misfire or weak combustion,and the pmax control mode is activated at high load to reduce the probability of abnormally high in-cylinder pressures.