Abstract: Based on the researches of torsional dynamic mechanics interlaminated shearstrength(ILSS),microimpact test,SEM ect,it is found that the bonding strength of the in-terface of the composite reinforced by untreated fiber is too weak to transfer the load effec-tively.The composite reinforced by the fiber,grafted with the polymers 100nm in thickness,has not only excellent.entire properties,but also outstanding ILSS.And the interface of thecomposite has not only enough elastic ability to bear the impact load but also the ability topermit the fiber to be pulled out from the matrix and to slide on the interface while impact-ing.On the other hand,the interface bonding of the composite reinforced by the fiber treatedwith plasma is so strong that there are hardly any pulling out from matrix and sliding on theinterface for the fiber while impacting.Therefore,it has no best anti-impact properties and ILSS.