Inclusion Criteria:  Traumatic long bone fracture. Noninfectious bone nonunion, delayed bone union. 3 months after the operation of the fracture, the examination showed no callus growth, no signs of progressive repair at the fracture site, fracture piece space < 5mm. No shortening, angulation and displacement. There was no obvious callus growth 8 months after local bone grafting.  Exclusion Criteria:  There are infection foci at and near the fracture end after fracture. 3 months after the fracture, tests showed partial callus growth. Combining shortening, angulation and displacement phenomena. Partial callus grew 8 months after local bone grafting.