In order to develop wood-based composite with high strength and toughness derived from shell structure,the nacre-inspired composite,without adhesive,was prepared by warm pressing process with poplar powder,poplar fiber and walnut shell granules.The mass ratio of poplar powder-walnut shell granules mixture to poplar fiber was optimized by single factor test.The process parameters were optimized by response surface method.Fourier transform infrared spectrometer,synchronous thermal analyzer and scanning electron microscope were used for characteri...