In this paper, the softening point, penetration, ductility, viscosity, complex shear modulus, rutting factor and PG grading index of asphalt modified with three high modulus modifiers were tested by conventional performance test and rheological test. The dynamic modulus and dynamic stability parameters of asphalt concrete prepared from the three kinds of high modulus asphalt were tested by uniaxial compression test and rutting test. Through the analysis of regularity, distinction and consistency of each index, based on grey relational analysis, the definition criteria of high modulus asphalt with complex shear modulus of high modulus asphalt as key index and penetration index system as auxiliary index were established. Finally, according to the dynamic modulus standard value of high modulus asphalt concrete, it is suggested that the complex shear modulus of high modulus asphalt G* (60 C, 10 Hz, 0.1%) should be greater than 66.43 kpa, G* (60 C, 10 Hz, 12%) should be greater than 12.8 kPa and softening point should be greater than 61.6 ℃

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