This　paper　proposes　a　practical　problem　of　optimization　of　product　assembly　process　in　Pinggao　Group　Co.,　Ltd.　According　to　custom＇s　demand,　it　needs　to　complete　the　productive　task　of　high　voltage　switch　products　in　a　strict　time　window.　The　practical　problem　is　originated　form　the　produce　demand.　The　objective　is　to　minimize　the　total　cost　of　product　assembly　process,　satisfying　the　time　constraint.　In　this　paper,　the　practical　problem　is　formulated　as　an　integer　programming　model.　Furthermore,　the　programming　model　is　improved　as　a　linear　integer　programming.　©　2012　IEEE.