石脑油既是裂解制乙烯的原料，也是重整制备芳烃的原料。在既有乙烯装置又有以生产芳烃为目的产物的重整装置的石化企业里，如何兼顾二者对原料油的要求，用好有限的石脑油资源，是十分重要的。本文以辽阳石油化纤公司为例，介绍了通过对预分馏系统的改造，实现对石脑油的合理切割，使其满足裂解和重整装置的不同要求，达到石脑油双向优化的目的。 Naphtha is both cracking ethylene raw materials, but also the preparation of aromatics reforming raw materials. In petrochemical enterprises that have both ethylene plants and reforming units for the production of aromatics, it is important how to balance the requirements of the two with feedstocks and use limited naphtha resources. In this paper, Liaoyang Petrochemical Company as an example, introduced through the transformation of the pre-fractionation system, to achieve a reasonable cutting of naphtha to make it meet the different requirements of cracking and reformer, to achieve the purpose of bi-directional naphtha optimization.