We often need to analyse a series of experimental data. A method frequently used is to fit the experimental data with a theoretical formula by adjusting the values of parameters in this formula.We have developped a programme to find the best adjusted values of the parameters with which a minimum deviation between the experimental data and the calculated values should be given.This programme allows to input the data by using either keyboard or on-line. Various functions can be easily chosen in this programme for different purposes.A complex spectrum can be deconvoluted into several sub-bands by using this programme.There are two modes to-fit the experimental data:manually fitting mode and the automatically fitting mode. In the former

the user can choise the test values of the adjustable parameters throuwh the keytcard. The experimental data and calculated curves shall be shown on the CRT screen.Some additional features are designed in this program me

such as the print of the best adjusted values of parameters

the plot of the experimental data and calculated curves.Two examples are given in this paper in order to explain the usage of the programme.