With　the　development　and　maturation　of　the　mining　information　technology,　computer　networks　and　communication　technology,　digital　mine　has　become　a　new　trend.　In　this　article,　the　author　makes　research　on　the　key　technology　and　algorithm　of　entity　modeling　in　three-dimensional　visualization　system　of　the　coalmine,　particularly　in　relation　to　the　modeling　algorithm　of　the　laneway　and　the　mine　industry　square.　On　this　basis,　establish　the　database　in　which　we　put　the　basic　data　of　the　model　of　laneway　cross-section.　By　modeling,　the　physical　situation　of　the　mine　is　displayed　more　clearly,　and　this　can　facilitate　people　to　understand　the　situation　of　the　underground　coalmine　more　clearly　and　comprehensibly.　©　2010　IEEE.