本文以胶济线为例，探讨了既有铁路提速改造线路方案的研究方法。提出了既有铁路提速线路改造方案研究必须结合既有线路状况、沿线地形地质等条件分段进行的观点。

This paper expounds the research method of alignment scheme of the Existing Railway Speed-Raising renovation. It put forward the standpoint that the alignment scheme research of Existing Railway Speed-Raising renovation must be divided into some paragraphs integrating with the condition of the Existing line's facility and the condition of the topography, geology along the railway line etc.