Abstract: This paper introduces an engineering realization of a Ka band 200W high linear solid state power amplifier (SSPA). By adopting hybrid and waveguide power combining technologies, a continuous wave output power of 250W can be realized at Ka band with 96 channels combined. In order to improve its linearity, RF predistortion technology is applied. And the third order intermodulation is better than -33dBc which the improvement is up to 15dB. To meet engineering and productive requirement, a standard configuration and good heat dissipation are designed. The control and maintenance func tions are provided, the operation and reliability are both met the engineering requirement.