Transformation behavior of TiNiCr shape memory alloys with different aging treatment was investigated by DSC, scanning electron microscopy (SEM) and the D/max2500PC automatic X-ray diffraction equipment (XRD). The results indicate that with increasing of the aging temperature, the transformation temperature As and Af increase but they decrease after 700 oC and TiNiCr alloy exhibits B2→R→B19′ two-stage martensitic transformation during cooling. Lots of Ti3Ni4 precipitants from aging treatment induce R phase transformation.