This study was to make powder by coprecipitation method and spray dispersion precipitation method in ($(1-$chi$)ZrO_2-$chi$MgO$</TEX> system to improve sinterability. As the result the specific surface area of powder prepared by spray dispersion precipitation method and coprecipitation method was above $110m^2$/g and $10-20m^2$/g respectively. Spray dispersion precipitation method was more effective than coprecipitation method in powder preparation.