The possibility of minitype titanium alloy impeller cast preparation by bottom vacuum suction casting was studied. At first, the effects of the processing parameters of bottom pouring vacuum suction casting on the horizontal flowability of TA15 alloy in a spiral mold cavity were investigated; then their effects on the filling ratio in gravity direction of a 1 mm thick plate was researched; finally a TA15 impeller was produced by employing reasonable processing parameters. The impeller cast has an integrated structure and fine edges and corners. Results show that gas pressure has a predominant effect on the filling process. The melt has a good filling ability both in vertical and horizontal direction.