从烃类原料裂解制乙烯的裂解性能和烃类馏份馏程及组成相关研究结果出发，提出了与世界乙烯原料轻质化的大趋势不同的扩大乙烯原料来源的思路：大庆原油的重馏份油即常三、减一线油和减二、减三线油酮苯脱蜡副产的蜡下油可以作乙烯原料。总结了该原料性能测试、模拟裂解炉评价及工业装置上应用的结果，证明该原料裂解时有较高的乙烯收率，也能保证裂解炉较长的运行周期，有明显的经济效益。

This article starts with the research results that the performance of the ethylene production from hydrocarbons cracking is linked not only to the distillation range of the hydrocarbon distillate, but also its components. It raises a new concept of expanding feedstock sources different from the global trend of using lighter feedstock. The heavy distillates of Daqing crude, such as the third cut of the atmosphere tower, the first cut of the vacuum tower and the sweat distillate which is the by-product of the de-waxing of the vacuum second and third cuts, can be used as feedstock for ethylene units. This article summarizes the performance tests of the feedstock, the evaluation in a simulated cracker and the application results on industrial units. It proves that the feedstock ensures high ethylene yield and longer service lfie of cracker, thus is of obvious economic benefits.