This paper apply the gray system theories , regard unit cost of historyical similar item construction as the basis , establish the non - isometric time sequence gm ( 1 , 1 ) model of item construction unit cost 摘要文章應(yīng)用灰色系統(tǒng)理論,以近期同類分項(xiàng)工程的單方成本為依據(jù),建立了分項(xiàng)工程單方成本價(jià)非等距時(shí)間序列g(shù)m ( 1 , 1 )模型。