Abstract: Geofluid played an indispensable role in almost all geological processes and was widely developed in different evolutionary stages of orogeny and sedimentary basin with different occurrences and various forms. Geofluid is considered to be the direct carrier of oil/gas or metal to form reservoir or deposit by migration and accumulation. The aim of geological mapping for geofluid is to solve special geological problems related to geofluid or to investigate natural resources formed along with geofluid formation, migration and accumulation. This paper discusses basic issues of geological mapping for geofluid for detecting features and forms of geofluid both in field outcrop and under microscope. It is proposed that the unit of geological mapping for geofluid should be divided by source and episode of geofluid itself. The essential work of geological mapping for geofluid is mainly to investigate geological features in field outcrop and determine geochemistry of the geofluid. The scale and scope of geologic mapping for geofluid could be flexible and be dependent on the aim and task of the work. Map representation should be a series of maps to reflect field distribution characteristics, variation of geochemistry, geodynamic history, active pathway and mineralization of geofluid. Geological mapping for geofluid provides new methods and ideas for geological research and prospecting work.