The development of femtosecond fiber lasers is briefly reviewed, and the recent advances in the high repetition rate femtosecond fiber lasers are reported. With the simulation, It′s demonstrated that the output pulse width is a function of the pulse repetition rate or the fiber length. With properly selected optical components and the dispersion management, Er3+-doped fiber laser of 330 MHz repetition rate, dispersion Yb3+-doped fiber laser of 490 MHz repetition rate, all-normal dispersion Yb3+-doped laser of 600 MHz repetition rate are developed. Those kinds of fiber lasers can be excellent optical sources for astro-combs.