Abstract: In order to investigate the influences of fiber-mat, shear plain and temperature on the shearing properties of multi-axial pultruded composite materials, the in-plain shear experiments on the traditional composites strengthened with chopped strand mats (shear plane perpendicular to or parallel to fiber direction), as well as the multi-axial pultruded composites strengthened with 90° uniaxial mat and ±45°/90° triaxial mat, were carried out at elevated temperatures. The results show that the main failure modes are diagonal micro buckling, debonding and shear failure, depending on the mat and shear plain. The shear properties significantly depend on the woven. Under ambient temperature, the average shear strength of specimens strengthened with the triaxial mat is 67.5 MPa, which is significantly greater than those of the specimens strengthened with the uniaxial mat and the chopped strand mat, which are 44.4 MPa and 45.2 MPa, respectively. The shear properties also depend on the shear plain. Under ambient temperature, the average shear strength of the chopped strand mat reinforced specimens with the shear plane perpendicular to the fiber direction is higher than that of the specimens parallel to the fiber direction (38.9 MPa). However, with the increase in temperature, the shear properties for all group specimens reduce rapidly while the difference in each group gradually becomes smaller. The calculation model for shear property of uniaxial pultruded composites based on thermal kinetic theory and parallel law is generally suitable for multi-axial pultruded composites. Finally, a formula was proposed for the calculation of shear strength and shear modulus of multi-axial pultruded composites at elevated temperatures. The research results could provide a basis for the shear design of multi-axial pultruded composites at elevated temperatures.