To choose the optimum of curve fitting and the optimal factor of the orthog onal polynomials is a very crucial question in the course of researching program , It's an impontant means of dealing with experimental data to fit curve with the orthogonal polynomials and minimum double multiplication, This paper uses a method of minimum double multiplication opproaching as fit culve experimental date by strict mathematical deduction and selection of the orthog and polynomials. The author uses F evalution determine the opimum of curve fitting and the o...