Abstract: In order to reduce shell crushing rate during mussel processing and improve technical level of mussel and related shellfish finishing production line, taking thick shell mussel as research object, three-dimensional model of mussel shell was obtained through reverse modeling of Thunk3D scanner．Static stress simulation of shell model was carried out to analyze distribution characteristics of deformation and displacement of shell after stress．Whole curved surface pressure bearing experiment of mussel shell was carried out by using tensile pressure testing machine, and pressure bearing performance of mussel shell was calculated．Combined with simulation results, orientation characteristics of crack path of broken mussel shell were analyzed．Results showed that when the shell was under pressure in high direction, average ultimate bearing load of overall surface of the shell was about 550 N, the maximum deformation under ultimate load was about 1.3 mm, and bearing performance was about 3.12 MPa．Crack extension distribution had obvious orientation, and more than 60% of the cracks were distributed in range of ±20° along rectangular central axis of mussel shell．Determination of pressure bearing properties and crack path orientation distribution of mussel shell could provide an important reference for optimization of force application structure of mussel and related shellfish processing equipment．