Due to the confidentiality of the geographical base map, the application of the 1:250 000 geological map to geological task and economic development is being excessively curbed at present. National Administration of Surveying, Mapping and Geoinformation in 2010 issued the public version of the 1:250 000 topographic maps. As a public use to the publication, it can be prepared for the indicative tourist map and other maps whose accuracy is not strictly required. This paper, based on a study of applying the public version of 1 :250 000 topographic map to 1:250 000 geological map, has analyzed the involved key techniques of the workflow which includes data format conversion, coordinate system and projection transformation, geographical elements replacement, as well as the topological register analysis, processing, and map decoration. The result has non -directional errors between 200 to 500 meters, and hence it can provide geological map view of low precision, but the application of the result to actual geological work remains somewhat impractical.%现阶段,1∶25万地质图受地理底图涉密的限制,在地质工作和国民经济中的利用受到严重制约.2010年国家测绘局发布1∶25万公众版地形图,提供给社会作为公开出版之用,利用公开出版地形图可以编制精度要求不高的旅游图等示意性图件.本文开展了1∶25万公众版地形图应用于1∶25万地质图的实验研究,提出了一套将地质图套合在公众版地形图上的处理流程和方法:主要包括格式转换、坐标投影转换、地理要素替换、套合分析与处理、地图整饰等,实验结果存在200～500 m的无定向误差,可提供精度要求不高的地质图浏览、展示使用,较难应用到实际的地质工作中.
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