Molding decorative building material with excellent physical performances was prepared from natural bagasse fibers via the hot forming process of fiber molding.Then,based on the tensile test,TGA and FT-IR analysis,the factors affecting the mechanical properties of the material were investigated.The results indicate that the tensile performance of the material is mainly affected by the dosages of flame retardant and reinforcing agent,the drying temperature,the drying time and the pressure,that,with the increase of flame retardant dosage,the tensile perfor-mance greatly degrades,that the optimal drying temperature and time are respectively determined as 160℃ and 4min,and that,in a certain pressure range,the tensile performance improves with the drying pressure at an optimal value of 30kN.Moreover,it is found from TGA and FT-IR analysis that,as there is no obvious thermal decomposition and chemical structure change of bagasse fibers during the preparation,the microstructure of the prepared material plays an important role in the tensile performance.In addition,the surface microstructure of the material was analyzed by means of SEM and AFM.