Bending beam rheometer test(BBR) and semi circular bend test(SCB) were conducted to study the low temperature performance of terminal blend(TB) crumb rubber composite styrene butadiene styrene(SBS) modified asphalt and its mixture with different contents of TB crumb rubber and SBS. The correlation of different low temperature performance indexes was analyzed. The results show that compared with the matrix asphalt, TB crumb rubber modified asphalt has excellent low temperature performance, and with the increase of the TB crumb rubber content, the low temperature PG of TB crumb rubber modified asphalt decreases, the thermal stress of asphalt decreases, and the low temperature crack resistance of mixture is enhanced; the low temperature performance of TB crumb rubber composite 3% SBS modified asphalt and its mixture is better than that of matrix asphalt, and with the increase of the TB crumb rubber content, the improvement effect of low temperature performance of composite modified asphalt is more significant, but is not better than that with the corresponding content of TB crumb rubber modified asphalt; with the increase of SBS content, the low temperature performance of 10%TB crumb rubber composite SBS asphalt does not change significantly, and the low temperature crack resistance of the mixture becomes poor; the low temperature PG grade of TB crumb rubber modified asphalt can well reflect the low temperature performance of asphalt and its mixture, while the low temperature performance of TB crumb rubber composite SBS modified asphalt cant be evaluated by a single low temperature PG index, which needs to be evaluated together with other indexes.