Experiments on high repetition rate all-fiber passive modelocked femtosecond laser are reported. Upon all-fiber ring cavity structure and nonlinear polarization rotation saturable absorber, stable run of high repetition rate Er-doped all-fiber modelocked femtosecond pulse is achieved. The highest repetition rate is 99.91 MHz. The spectrum FWHM is 25 nm at center wavelength of 1570 nm. The pulse duration is 194 fs. The dynamic characteristics of the all-fiber passive modelocked laser at different repetition rate are studied. The results show that the all-fiber laser can be used as an alternative compact and high stable ultrafast optical source for application in the optical frequency comb generation.