This paper analyzes the key technologies about the utilization of old asphalt mixture,according to the application of hot-in place recy-cling technology in Guangdong Ji-He Expressway. The main contents include the evaluation of old asphalt mixture,mixture design and the rate of utilization about old asphalt mixture’s affection to the road performance of hot-in place recycling asphalt mixture. The results show that,with the increase of new added asphalt mixture’s proportion,the dynamic stability of hot-in place recycling asphalt mixture decreases,its high temperature stability reduced,but the water stability and low temperature cracking resistance significantly increased.%依托就地热再生在广东机荷高速的应用实例，对旧料利用的关键技术进行了研究，主要包括旧料的性能评价、再生混合料的配合比设计以及旧料利用率对再生料路用性能的影响，研究结果表明，随新料添加比例的增加，再生混合料的动稳定度减小，高温稳定性减弱，而水稳定性和低温抗裂性显著提高。
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