In this paper,Tl-2223 superconducting thin films on( 001)-oriented lanthanum aluminate substrates were prepared by magnetron sputtering and rapid heating-up sintering technology( RHST). The effects of different Tl content in annealing target on the crystal structure of Tl-2223 thin films were studied. The XRD test shows that the Tl content in annealing target is the key to the preparation of high quality Tl-based films,and the purely c-oriented Tl-2223 films can be prepared by using suitable proper proporti...