A method for controlling hydraulic pressure of a damper clutch may include determining a hydraulic pressure control mode of the damper clutch in accordance with vehicle driving conditions and a state of the damper clutch, determining a hydraulic pressure control value according to the hydraulic pressure control mode, determining target waveforms of engine rotation speed and turbine rotation speed according to the hydraulic pressure control mode, detecting a waveform of the engine rotation speed and a waveform of the turbine rotation speed, judging whether detected waveforms of the engine rotation speed and the turbine rotation speed correspond with the target waveforms thereof respectively, and, regulating the hydraulic pressure control value so as to make the detected waveforms of the engine rotation speed and the turbine rotation speed correspond with the target waveforms of the engine rotation speed and the turbine rotation speed respectively.