Abstract: The 20 mm-thick Ti80 alloy plates are used as ship structural component. On theoretical basis of elastic-plastic mechanics, the restraint intensities of Y grooved specimens with or without load block are analyzed by ABAQUS software, and the restraint intensity of the specimens with load block are measured.Resultsshow that the values obtained from simulation and actual measurement are in accordance, presenting that the accuracy of the finite element simulation. The restraint intensity of the specimen is relative to the distance between the load blocks. The smaller the distance is, the smaller the restraint intensity is. The restraint intensity of the specimen without load block is significantly smaller than that of the specimen with load block. It's conservative to use the specimens with load blocks to evaluate crack sensitivity.