In order to improve sound and thermal characteristics of solid wood composite doors, the authors developed an optimization structural design for the door leaves. The modified wood composite door leaf was made of laminated veneer lumber（LVL） as the frame and with high density fiberboard（HDF） as the face layer of door sheets to replace MDF, and with glass fiber as the filler to replace honeycomb paper. Live sound pressure level measurement and heat flow metering methods were used to measure sound insulation and heat transfer coefficient values, respectively.The results showed that compared with control composite doors,the sound insulation of the modified door increased by 1.2 times with much lower heat transfer coefficient value,which reached the highest level.