To investigate the effect of surface current density on the combustion performance of hydrazine nitrate-based electrically controlled solid propellant （HAN-ECSP）， the contact area ratio between HAN-ECSP and Cu electrode was adjusted to regulate the surface current density of propellant. Decomposition， combustion and repeated on-off combustion performances were studied using gas collection and combustion test. The results indicate that the combustion performance of propellant is improved significantly as the increase of surface current density between the cathode and propellant. However， too small effective contact area could lead to excessive local current density， potentially causing the damage of electrode. Hence， the optimal contact area ratio between anode and cathode is 1∶0.4. Compared to unchanging the contact area between electrode and propellant， the surface current density rises from 301 to 2466 A·m^-2. The results of gas decomposition pressure test and combustion indicate that the total gas pressure increases by 4.8 times， gas generation rate increases by 12 times， ignition delay time of propellant decreases from 3.13 to 0.76 s and mass combustion rate increases from 0.07 to 0.22 g·s^-1， when the surface current density rises 2165 A·m^-2. Moreover， the propellant still maintains excellent repeated on-off combustion performance at this surface current density.