According to the engineering example, the technology reconstruction plan of the existing rigid frame bridge with inclined leg in the highway construction and expressway reconstruction is discussed, and several technical reconstruc-tion schemes based on system transformation are introduced and compared. And an optimization scheme "the cable-stayed system with twin towers―single cable & external prestressing" is chosen. Theory analysis and practice show that the method of system transformation for reconstruction rigid frame bridge with inclined leg is feasible.%结合工程实例，对高速公路改扩建中既有斜腿刚构天桥再利用的改造方案进行了探讨，介绍了几种基于体系转换的技术改造方案，并通过对比推选出优选方案：“双塔斜拉体系―――单索+体外预应力”。理论分析与实践表明，体系转换法进行斜腿刚构桥梁改造是可行的。
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