Abstract: Resonance method of the material Poisson’s ratio measurement at elevated temperature is investigated. A method for supporting rectangular sample based on three ceramic rods is proposed, the supporting positions are determined based on the modal nodes of both bending and shearing mode shapes, material parameters such as elastic modulus, shear modulus, Poisson’s ratio and damping factor are tested by impulse excitation technology, the flowchart for Poisson’s ratio measurement at elevated temperature is illustrated, and related issues are discussed. A SiC grain reinforced Aluminum alloy is taken as an example, the relationship between Poisson’s ratio and temperature is obtained. Results show that Poisson’s ratio slightly increased as temperature increased. The discussed Poisson’s ratio measurement method is feasible for the measurement of other solid materials, such as metals, ceramics and titanium, at elevated temperatures.