Abstract: Three synthesizing methods of n-section power divider are reviewed. However, with the increase of the sections, the classical synthesizing method will yields wrong results. In consideration of this problem, this paper puts forward the modified design formula by introducing a scaling parameter. Thus, the modified method can well be used in the design of broadband power divider. The characteristic impedances of the transmission lines of a power divider can be obtained by using the classical cascaded quarter-wave impedance transformer theory. A MATLAB program which can be used in computing the transmission lines parameters easily is introduced. A design table which can be used in designing broadband power dividers with sections form 8 to 15 is given. This paper makes comparisons between the synthesized isolation curves and the optimized ones. The results show that the synthesized isolation curves are almost equal to the optimized ones. An 1 ~15 GHz power di vider has been constructed and the measured data validates the modified design formulas are effective.