A method for controlling a hydraulic pressure refilling operation for an engine clutch of a vehicle includes determining whether the vehicle travels using power of a driving motor with an engine clutch maintained in a disengaged state, and upon determining that the vehicle travels using power of the driving motor with the engine clutch maintained in the disengaged state, determining whether loss of hydraulic pressure has occurred, and upon determining that loss of hydraulic pressure has occurred, controlling a hydraulic pressure refilling operation such that working fluid in a reservoir is supplied to the actuator with the engine clutch in an engaged state, and controlling the driving motor so that the driving motor outputs a compensated torque by compensating for an effect of a load torque, generated by a non-operating engine, on a torque of the driving motor.

A launch control method of a vehicle includes: a clutch hold step of maintaining a clutch torque until an engine torque becomes smaller than the clutch torque, when a driver releases an accelerator pedal during launch control; a time constant determination step in which a time constant for a rate of releasing the clutch torque is determined depending on a difference between the clutch torque and a target creep torque when the engine torque becomes smaller than the clutch torque; a filter processing step of processing the time constant and the target creep torque using a low-pass filter that has the time constant and the target creep torque as an input and has a nominal clutch torque as an output; and a clutch control step of controlling a clutch using the nominal clutch torque.