Abstract: With the wide use of composite materials,the interface fracture mechanics has received specific attentions. During the past few years,a lot of considerable researches have been carried out and many questions regarding the interface fracture mechanics have been answered . Such as the edge crack terminating at and crossing the interface, the T shaped crack consisting of a broken layer and a delamination crack, the cross shaped crack which consists of delamination crack intersecting a crack which is perpendi...