Nonlinear least square method programs which are used to curve fitting were programmed in matlab language . creep data of 600 < wp = 5 > were curved and analysized based on strain hardness theory and function method 运用matalab语言编制非线性最小二乘法拟合程序,用应变硬化理论和函数法拟合600的蠕变数据,并进行分析。