Abstract: Dynamic shear fracture is one of common failure modes of ductile metals. The dynamic shear property of TC4 alloy fabricated by laser solid forming (LSF) was investigated with micro split Hopkinson pressure bar and double-notch shear (DS) specimen in this paper. The notch shape as well as width and length of shear zone of DS specimen were optimized by numerical simulation, by taking into account homogeneity of stress and strain as well as stress triaxiality. The mechanical properties of as-deposited LSF TC4 alloy in different orientations were studied experimentally at the order of shear strain rates of 10<sup<4</sup< s<sup<-1</sup<. The results show that there is no obvious anisotropy in dynamic shear property, while the flow stress increases with increasing strain rate and there is approximate linear relationship between them.