Combining with cast-in-situ box girder bridge engineering of Niulangguan overpass on Nanhuan line of Guiyang city highway as an ex-ample,in light of its local geological conditions,the article puts forward machine-made sand vehicle pumping concrete scheme,and continuously optimizes its mixing proportion design. As a result,it guarantees engineering quality,shortens construction duration,and reduces construction cost.%结合贵阳市环城高速公路南环线牛郎关互通立交现浇连续箱梁桥的工程实例，针对其所属地区的地质条件特点，提出了采用机制砂汽车泵送混凝土的方案，通过不断优化配合比设计保证了工程质量，缩短了施工周期，降低了施工成本。
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