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以大蒜粉作胶粉改性沥青的降粘剂，采用布氏粘度计测试了不同胶粉用量＋不同大蒜粉用量的改性沥青粘度，还测试了添加大蒜粉后胶粉改性沥青的软化点、针入度和延度等性能，并讨论了降粘剂对胶粉改性沥青降粘效果的影响。结果表明，大蒜粉对胶粉改性沥青有明显的降粘效果，对其他性能也有一定影响；当基质沥青中加入25％胶粉和3％大蒜粉后降粘效果和性能均最佳。“,”By using garlic powder as viscosity reducer of asphalt modified with rubber powder ,the viscosity of asphalt modified with different content of rubber powder and different content of garlic powder was measured by Brookfield viscometer .The softening point ,penetration and ductility of the asphalt modified with rubber powder were tested after adding garlic powder ,and the influence of vis‐cosity reducer on viscosity reduction effect of the modified asphalt was discussed .The results showed that garlic powder had apparent viscosity‐reducing effect to the modified asphalt ,and the other proper‐ties were also effected .Viscosity‐reducing effect and properties were good after adding 25% rubber pow der and 3% garlic pow der to the base asphalt ,respectively .