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Aiming at the different boundary constraints and harsh high temperature environment of plate structure, a variable boundary high temperature test modal system is developed, which provides a low cost and variable boundary test system for the measurement of plate structure under high temperature vibration coupling environment. The test system uses virtual instrument LabVIEW to control the temperature of quartz lamp array. A high temperature resistant ceramic guide rod extension device is developed to transmit the vibration signal from the plate structure to the non-high temperature area. The plate structure is stimulated by a vibrator. The response signal is measured by an acceleration sensor at room temperature. The system uses frequency-frequency combination. The technique identifies the measured modal data and obtains the modal parameters of the plate structure. Taking No. 45 steel plate as test sample, the modal parameters of different boundaries at room temperature were obtained, and the modal parameters of No. 45 steel plate were obtained by high temperature vibration coupling experiment under unilateral constraints. The test system can provide a reliable basis for the safety design of plate structures under the coupled environment of variable boundary and high temperature vibration.