The experimental results on morphology evolution of macroscopic deformation domain during stress-induced phase transition under uniaxial tension in superelastic NiTi polycrystalline microtubes are reported in this paper. It focuses on morphology of the domain front during unloading process. A series of high-resolution digital photos were taken from the tube surface under equal incremental elongations. The 3D geometry of the front was quantified by an optical profiler. New propagation modes of the front such as rotation and crossing were found.