Abstract: For the forecast precision of austenite linear equation is far from actual requirement in casting of 1.4517(name GX2CrNiMoCuN25-6-3-3)duplex stainless steel,partial parameters of austenite linear equation are redressed on account of practice experience and examination is designed to validate the precision and applicability of the equation.The redressed equation has a good effect and the absolute error is less than 5%.