This paper presents the high linear even harmonic mixer driven by the pulsed LO for achieving high power and low distortion performance. For the objectives, positive and negative pulses pump an anti-parallel diode pair as the LO voltage. Duty ratio of each pulse is 25% for the LO period. This means that the pumped conductance Gj of the anti-parallel diode pair includes the highest level of the second order harmonic. This can reduce LO dependence on the conversion efficiency of the even harmonic mixer. Theoretical and experimental investigations confirm effectiveness on the high power and the low distortion performance of the even harmonic mixer with the proposed LO waveform.