Abstract The 1:50 000 comprehensive engineering geological map is the foundation of the planning and construction of new urbanization. However, there is no unified technical standard for the compilation of the 1:50 000 comprehensive engineering geological map so far, which can’t meet the needs of engineering geological mapping. By summarizing the domestic and foreign theories and methods of engineering geological mapping, and combined with the current project “1:50 000 engineering geological survey and mapping of northern urban planning areas of the urban agglomeration in Central Plains ”, the authors have compiled a 1:50 000 comprehensive engineering geological map, taking Jiaozuo City as an example. Furthermore, the theories and methods of compiling the 1:50 000 comprehensive engineering geological map have been discussed, and new opinions and ideas on the purpose, subject expression, engineering geological zoning, division of engineering geological layers and layout of the engineering geological map have been put forward. The expressed subject of 1:50 000 comprehensive engineering geological map is the comprehensive characteristics of engineering geology, and the engineering geological zoning is the concrete expression of the subject. According to the macroscopic engineering geological conditions, the engineering geological zoning can be carried out based on the difference of the topography, stratum lithology (engineering geological layer), geotechnical structure or deformation strength, crustal stability or active faults (earthquakes), and adverse geological phenomena or geological disasters. The engineering geological layer should be taken as the basic mapping unit, and the division of the engineering geological layer can be carried out according to the “GB/T 50218-2014 Standard for Classification of Engineering Rock Mass”. In addition, the engineering geological features should be reflected as much as possible, including (but not limited to) each engineering geological borehole histogram, hydrogeological elements, internal and external dynamic geological phenomena, major engineering geological problems and so on. The comprehensive engineering geological map should be composed of the main body plan, inlay map, section map, comprehensive borehole histogram, engineering geological feature description table and legend, all of which should be scientifically and reasonably configured.
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