Nano-SrFe12O19 magnetic powder was preparaed with sol-gel method, and its magnetic properties were detected by a magnetometer. The TiO2 film containing SrFe12O19 powder was coated on the surface of NiTi alloy and 316L stainless steel with sol-gel method and the elements of film were analysed by XRD. The micro-magnetic field magnetization of TiO2 films containing SrFe12O19 powder with different layer numbers were tested and the dynamic clotting time and the hemolysis rate of these different films were tested. All results show that the higher the micro-magnetic field strength of material surface, the better the blood compatibility.