The 1000 W continuous laser diode planar array is made up of 30 diode bars at the wavelength of 808 nm with each power of 40 W and forms a rectangle luminescence aperture of 12 mm×70 mm. These bars was mounted on modular microchannel cooled headsinks (MCC) and can continuously emit the laser by the coolant passing through MCC under 0.5 MPa pressure. The total continuous power is 1060 W and the average power density is 126 W/cm2 at wavelength of 808 nm when the current is fixed 50 A. Five uniformity K-type thermoelectric couples are placed on the different five silicon headsinks of the planar array and used to measure the temperature increase with the loss thermal power. The measuring result of thermal impedance of the planar array is about 0.009 ℃/W.