Electric and magnetic properties of TiNi alloy have been investigated near the temperatures of martensite-austenite phase transition. The paramagnetism resulted from conduction electrons and the ferromagnetism resulted from a few located electrons have been analyzed from M-H curves. There is an abrupt drop of magnetization at about 180K in cooling M-T curve, and there is an abrupt rise at about 230K in heating curve. The temperature dependence of resistivity shows similar behavior to the M-T curve, i.e. the resistivity ρ-T　of the samples also experiences abrupt change at similar temperatures. Furthermore, the temperature dependence of specific heat capacity for the sample displays an obvious peak during heating process. All the results show that the temperatures of martensite and austenite phase transition are about 180 and 230K respectively. On the other hand, the M-T curves show that the magnetization of martensite phase is smaller than that of austenitic phase at the same temperature. Moreover, when the strain is no more than 6%, the mechanical strain weakens the magnetism of TiNi alloy samples, while it does not change the temperature of martensite-austenite phase transition.