Various kinds of flame retardants mixed together will improve the flame retardation significantly. Effects of a mixture of microencapsulated red phosphorus/aluminum hydroxides/stibium oxides/methyl phosphoric dimethyl on flame retardant performance and mechanical properties of the matrix resin 9001 were investigated, and a new price-advantages resin system which showed excellent mechanical and flame retardant performance was determined. The test results showed that the properties of resin 9001 with flame retardant system 12%MRP,50%Al(OH)₃,2%Sb₂O₃ is the best of all. Viscosity of the resin system at room temperature is about 100mPa·s, and the gel time of the resin is beyond 80 min, which satisfies the requirement of RTM and VIMP process for large composite parts. The tensile strength and modulus of the glass fabric reinforced the resin composites are 215.4MPa and 13.85GPa, respectively. The bending strength and modulus are 177.15MPa and 13.36GPa, respectively. And the LOI of the composites is 39.7.