Abstract: The stiffness and strength of hybrid fiber reinforced polymer(HFRP) with plain fabric as reinforcement were studied. The hot-pressing process was designed and 7 groups of carbon-basalt hybrid fiber reinforced epoxy resin matrix composites specimens with different hybrid ratios were prepared for tensile test. Based on the structural characteristics of plain fabric, the traditional hybrid law was modified and a HFRP stiffness estimation model using plain fabric as reinforcement was proposed. According to the failure mechanism of HFRP laminates, the critical hybrid ratio of materials with only one failure was proposed and a strength estimation model with three ranges of hybrid ratios was also given. Finally, the estimation results were corrected by the coefficient of hybrid effect which reflects dispersion. The result shows that the calculated values and experimental values are similar and the critical hybrid ratio calculated fits the result of stress-strain curve analysis. The model can provide a theoretical basis for practical application in the future. The prediction method proposed in this paper can reflect the influence of hybrid ratio on the HFRP strength and stiffness of plain fabric, and expands the range of application of the mixture law.