In the 940 nm LD pumped Yb∶YAG laser, the stable mode-locked trains wavelength at 1030 nm and 1050 nm is obtained by use of two pieces SESAM.The spectrum FWHM are 1nm and 2 nm. The repetition rates are 190.24 MHz and 178.6 MHz. The average power of output is 80 mW and 60 mW when the pump power is 4W.