A process to synthesize $La_{0.8}Sr_{0.2}CrO_3$ (LSC), which is a promising material for use as a separator in a soild oxide fuel cell, is investigated in this study. LSC powders without secondary Phases could be synthesized with ultrasonic spray pyrolysis and a heat treatment at $1200^{circ}C$ for 20 h; however, it showed an average diameter of $0.6{mu}m$ with a wide particle size distribution. On the other hand, LSC powders synthesized with spray pyrolysis at $800^{circ}C$, heat-treated at $900^{circ}C$ for 5 h, ball-milled and finally heat-treated again at $1200^{circ}C$ for 20 h showed a smaller average diameter of $0.3{mu}m$ and narrower size distribution. Very few particles above $0.5{mu}m$ were found. Thus, a proper combination of the heat treatment and milling process after spray pyrolysis it determined to be very important in synthesizing fine and uniform LSC perovskite powders.