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Aiming at the measurement of deformation parameters of the fast reactor fuel assembly, a deformation measurement system based on the line structure light was designed. Considering the effect of radiation on the electronic components and measurement accuracy, radiation shielding design of the measurement system was carried out. The effect of refraction of the radiation shielding glass on measurement was studied. Based on the air-line structured light measurement model, a line structure light measurement model of the refractive correction was proposed. The calibration of the measurement system was carried out in the air, and then the measured value of added glass was corrected. Several measurement experiments results prove that the correction error of the refractive correction model is ±0.05 mm, and the standard deviation of global parameter measurement of the line structured light fuel assembly measurement system is not more than 0.03 mm. The measurement system can achieve high precision measurement of the deformation parameters of fuel assembly under a certain irradiation dose, which is of great significance for obtaining the physical parameters of fuel assembly and the reactor core design.