Short beam shear tests of basalt fiber reinforced composite （BFRP） bars and glass fiber reinforced composite （GFRP） bars at different temperatures were carried out， and the shear properties of the bars at high temperature were studied. The prediction and calculation models of the temperature effect on shear strength of BFRP and GFRP bars after temperature were put forward. The results show that the shear strength of BFRP and GFRP bars decreases gradually with the increase of temperature. The shear strength degradation rate of the BFRP and GFRP bars with a diameter of 12 mm is faster than that of bas with a diameter of 16 mm. At 270 ℃， the shear strength retention of the bars decreases with the extension of the constant temperature time， but the degradtion rate of BFRP bars is significantly lower than that of GFRP bars. The shear strength degradation of BFRP and GFRP bars is mainly due to the reduction of the cross-linking degree between the fiber and resin matrix and the thermal degradation of the matrix. Compared to GFRP bars， BFRP bars have better high temperature resistance.