The sub-Doppler absorption laser spectroscopy at 728 nm transition from the 5D5/2 state to the 6F state of cesium with linewidth near 10 MHz is first experimentally performed with indirect pumping from the ground state 6S1/2 to the state 7P3/2 by a 455.5nm diode laser.Using a 455.5nm diode laser as an indirect pump laser,several excited states will be populated due to spontaneous decay from the 7P state.We first implement the sub-Doppler absorption laser spectroscopy at 728nm from the 5D5/2 state to the 6F state when Cs atoms within thermal glass cell decay to the 5D5/2 state.Due to velocity transfer effect,the hyperfine structure of 5D5/2 shows a mixed and complicated patte but very clear structure when the 455.5nm pumping laser is counter-propagating (or co-propagating) with the 728 nm probing laser.