The preliminary design of a multi-barrels pellet injector with cycle refrigerator asan advanced plasma-fuelling tool for HL-2A tokamak has been proposed. The design aims atprecise temperature control, easy operation.with high reliability and high flexibility. GM-cyclerefrigerator and pipe-gun Structure have been employed to produce 25 pellets in 25 gun barrelssimultaneously and the design aims. have been accomplished. Prime design principle, engineeringparameters, structure and layout of the cryostat components as well as calculation of heat loadfor the cryostat are presented.