The track plinth is constructed so as to provide support for rail fasteners to clamp down the running rail. The aim of this article is to compare the construction characteristics of two construction methods. The first one is "the steel mold formwork" which is utilized on the section of the Nangang line east of Taipei Main Station; the other one is "GSF mold formwork" which is adopted on the Tucheng line. The article also depicts the development of key technology for the monolithic plinth construction on the Xin-Lu line.