An active mode-locked control method is presented.Firstly based on the parametric autonomous differential equation of actively mode-locked laser，parameter setting method is derived when the system is stable.Then using lithium niobate’s nonlinear effect，a series of functions with Bessel coefficients are obtained.The difference of carrier frequency and side frequency is integral mutiple of the modulation frequency.Finally ultra-short laser pulses with high repetition rate and high order mode-locking are generated.The experiment results show that：the mode loss can be controlled by adjusting the modulator’s parameters，with 1GHz of modulation frequency，10GHz repetition frequency ultra-short laser pulse sequence are obtained.The chirped pulse shape is a good Gauss type.