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Carrying on a series of compression and shear tests by a large number of specimens,reliabilities of T300/QY8911 laminated composite were studied when dispersibility models were described.The results show that the stress is linearly dependent on the strain and the damage modes of specimens are brittle fracture for both kinds of tests.Dispersibility models of compression and shear strength are expressed as Rc～N(415.39,6 586.36) and Rs～ln(5.071 8,0.155 3),respectively.When normal and lognormal distributions were used to describe the dispersibility models of compression and shear strength,and the compression or shear load follows the normal distribution,the almost same failure probability can be obtained from different reliability analysis methods.