Abstract: A carbon/glass hybrid fibers reinforced epoxy resin composite core was made by pultrusion,and its density,mechanics,thermal expansion,dynamic mechanical and durable properties were studied.The bend strength of the composite is more than 1 600 MPa,the tensile strength is more than 2 000 MPa,and the density is only 1.76 g/cm3.The coefficient of thermal expansion(CTE) is 0/℃in the range of 25-310℃.The glass transition temperature of the composite is up to 171℃,and it can be used at 140℃.Accelerated aging test shows that the composite has a good durability.