The new type of graphene like material, represented by molybdenum disulfide (MoS2), has many advantages of adjustable band gap, high modulation depth, and wide band saturable absorption. It is widely used in ultra-fast pulse laser. The MoS2 nanoscale solution is obtained by lithium-ion intercalation method. High quality MoS2 saturated absorber (SA) was prepared by ultrasonic, centrifugation, spin coating and drying. The MoS2 film is characterized by Raman spectroscopy and atomic force microscopy. The results showed that the film is a few-layer structure (2-3 layer) with good uniformity. The new MoS2 SA is placed in a W-type all solid state laser system, stable passive mode-locked operation at 1063.9 nm is achieved. When the pump power reached 6.86 W, the average output power of the mode-locked laser is 894 mW, the energy and peak power of monopulse are 10.28 nJ and 2.056 kW, respectively, and the pulse width is 5 ps.