Experiments and analyses of the main characteristics of NiTi alloy wires were completed to research their ability in active detection and control of cracks growth as the special requirements of the intelligent material structures.The expressions of the main characteristics as recovery force and other parameters are deduced on the basis of measurements.The research results show that the NiTi alloys wires are very good functional materials for manufacturing the intelligent structures capable of actively detecting and controlling the growth of cracks and vibration.