Discussion on fitting method of classical line type in hydrology

To improve the representativeness of hydrological measuring data by interpolation, on the basis of the existed historic hydrological measuring data, the multiple linear regression equation of annual precipitation, the function models including the relationship between flow and level in natural river channel, reservoir sluice discharge and openness, relationship of output of power plants, are established through the graphic function and planning solution function of Excel. The key parameters of the models are calibrated and the fitting formula that can express the above relations accurately is obtained. In practical application, the fitting functions and the physical meaning of the variables should be combined and the sample number should be enlarged, which is helpful in improving the accuracy of the hydrological data and realizing the informatization of hydrology.