Research　purposes：During　the　pushing　construction　process，the　small-angle　skew　intersection　between　the　new　and　existing　lines　causes　difficulties　in　arranging　temporary　piers　at　the　crossing　sections　and　results　in　large　cantilever　spans　of　the　main　girder.　This　increases　construction　difficulty　and　challenges　the　safety　of　the　construction.　To　address　this　issue，based　on　the　Guangzhou-Shanwei　High-speed　Railway　overpass　on　the　Shenzhen-Shantou　West　Expressway，through　Midas　finite　element　simulation　analysis　and　monitoring　of　stress　and　displacement　in　the　actual　bridge，the　key　technologies　for　pushing　construction　of　high-speed　railway　steel　box　girders　with　a　single　mid-span　temporary　pier　were　studied.　Research　conclusions：（1）　The　pushing　construction　scheme　without　a　temporary　mid-span　pier　does　not　meet　construction　requirements.　（2）　The　single　mid-span　temporary　pier　pushing　scheme　ensures　that　the　stress　and　displacement　of　the　main　girder　are　within　safe　limits　during　the　pushing　construction　process，meeting　construction　requirements.（3）The　alignment　and　stress　state　of　the　completed　bridge　met　the　design　expectations.（4）In　small-angle　skew　pushing　construction　where　temporary　piers　cannot　be　set　up　on　the　road，the　single　mid-span　temporary　pier　pushing　scheme　can　be　used　as　an　alternative.　The　construction　and　monitoring　methods　discussed　in　this　paper　can　provide　a　reference　for　similar　projects.　©　2024　Editorial　Department　of　Journal　of　Railway　Engineering　Society.　All　rights　reserved.