In order to explore the correlation of the evaluation index between the conventional and rheological performance of bio-asphalt modified asphalt, rock asphalt modifier asphalt and its composite modified asphalt binder, the conventional and rheological properties of three kinds of modified asphalts were tested. The correlation analysis was conducted from the aspects of high temperature property, low temperature property, service temperature range and temperature susceptibility. The test results and analyses indicate that the correlation between the softening point and the equivalent softening point of the three kinds of modified asphalt is conspicuous, and the equivalent softening point has a significant linear correlation with the high continuous grading temperature. The linear correlativity between the bio-asphalt modified asphalt's equivalent breaking point and low continuous grading temperature of bio-asphalt modified asphalt is prominent, while the other two kinds of modified asphalts show complex parabola relation. It is necessary to evaluate the low temperature performance of asphalt comprehensively by combining these two indexes. The difference between the equivalent softening point and equivalent breaking point has a significant linear correlation with that between high continuous grading temperature minus and low continuous grading temperature, and the evaluation of service temperature range of asphalt is consistent. The correlation between penetration index and complex modulus index of three kinds of modified asphalts is noteworthy, and the evaluation of temperature susceptibility performance is consistent. The rheological performance can be estimated reasonably through the conventional performance index.