This paper presents a millimeter-wave predistortion linearizer, which used a GaAs Schottky diode with a bias feed resistance in integrated fin-line technique. The predistortion line-arizer with a single parallel diode is capable of providing up to 4.5dB gain compensation and 20 degree phase compensation. Combining with the integrated fin-line structures, the linearizer has lower insertion loss, and it is convenient to fabricate especially at millimeter-wave lengths. Experimental results show that the method applied in fin-line is reliable and effective.