After distal radius fracture, delayed rupture of extensor pollicis longus is rare. It is known that delayed rupture of extensor pollicis longus tendon result from undisplaced distal radius fracture. We have experienced a case of rupture of the extensor pollicis longus tendon after undisplaced distal radius fracture, and treated with palmaris longus tendon graft. the result were satisfactory without complications.