Abstract: Based on a low-temperature strain gauge and an extension displacement transducer, this paper presents the strain measurement of a cantilevered beam soaked to liquid nitrogen. The accuracy of the measurements was compared, and the corresponding calibration curves were obtained. Some factors including the strain gauge bonding, bridge connections, liquid nitrogen cooling and data acquisition influenced on the experimental results were discussed. The results show that low-temperature strain gauges can work well in liquid nitrogen cooling environment when the proper experimental conditions are considered such as temperature compensation, firm paste and good curing. The displacement transducer is little affected by low temperature environment, and it was convenient to measure the displacement of a structure under liquid nitrogen cooling environment. The present results may provide some basis measurements on mechanical properties of Lan Zhou Penning ion Traps 7T superconducting magnet developed at the Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS) in low temperature environment.