基于珠江水系干流之一的西江上游14个水文测站水位流量数据,应用非线性最小二乘法(NLS)和异方差最大似然估计法(HMLE)分别绘制每个测站水位流量曲线标准残差图.结果表明:14个水文测站中有5个测站对NLS是适用的,9个测站对NLS不适用;而对于HMLE法,则有11个测站是适用的,仅3个测站不适用.因此,对比NLS法,HMLE法大大提高了对水位流量曲线的适用性. Based on the data of water level and discharge of 14 hydrological stations in the upper reaches of the Xijiang River, one of the main stream of the Pearl River, the standard residuals of the standard curves of water level and flow in each station were plotted by using Nonlinear Least Squares (NLS) and Heteroscedastic Maximum Likelihood Estimation (HMLE) The results show that of the 14 hydrological stations, 5 stations are suitable for NLS, 9 stations are not applicable to NLS, while for the HMLE method, 11 stations are applicable and only 3 stations Therefore, compared with the NLS method, the HMLE method greatly improves the applicability of the water flow curve.