Abstract: Tensile strength, interlaminar shear strength （ILSS） and fractured surface morphology of unidirectional composites with various matrices were examined in order to make clear the relationship between fractured surface morphology and properties of the composites. When the properties of matrices suit well with the properties of fibres, maximum tensile strength and mixed failure mode of composites can be observed. This is because the fibres play a reinforming role fully in the composites.Bending strength, ILSS and fractured surface morphology of unidirectional composites With different duration of applied pressure during curing were also examined. With adequate duration of applied pressure, optimal bending strength and ILSS of the composites together with mixed fracture mode can be obtained. The results are meaningful for the material design of composites.