According to the least square method, known unit construction prices of pipelines are fitted with nonlinear function or power polynomials of diameters of pipelines, and calculated results are more improved as against those of former method.

• 用电算按最小二乘法用非线性函数或管径幂的多项式拟合单位长度管线已知造价；提高了计算结果与已知值的总体符合程度.