ObjectiveTo probe into the clinical efficiency of reconstruction to person who had composite tissue defect of the floor of mouth and the lower part of face with the free forearm flap and free iliac bone in the same term.MethodsBefore the surgery, the surgeon should carefully evaluate the scope and shape of defects in 11 cases who had the composite tissue defects of the floor of mouth and the lower part of face, to design the individual forearm flap, so that it matches with the defect region. During surgery, the first resumption of defects using titanium plates forming the basic shape of mandible and the occlusal relationship,then used to re-sawing to take modeling of the iliac bone,transplanted free iliac bone and fixed after the inside of the titanium plate, thereby restoring the continuity of mandible missing.ResultsFree forearm flap and free iliac bone all survived in 11 cases, the success rate of 100％. The patients were followed up for 6 to 12 months, although the shape of restoration areas were different levels of fat, but eating, swallowing and other oral function had been well improved, 7/11 could enter normal diet, 4/11 to enter liquid diet, At the same time, the patients in social activities can communicate in a language daily, sensory function of skin flap and facial appearance has been satisfactory recovery.ConclusionConformal free forearm flap and free iliac bone is an ideal way to reconstruct the composite tissue defects of the floor of mouth and the lower part of face in the same period, not only safe, practical prognostic effect, and also can significantly improve the patients quality of life, which is worthy of reference and use.