Ultrahigh-pressure (UHP) metamorphic rocks record the interactions between fluid/melt and rocks during the continental subduction and exhumation, presenting an excellent natural laboratory to study the composition and evolution of fluid/melt phases in deep subduction zones. The multiphase solid (MS) inclusions enclosed in minerals of UHP metamorphic rocks provide the authors the key information on the behavior of fuild/melt during UHP metamorphism of continental crustal rocks. The occurrence of MS inclusions in UHP metamorphic rocks provides not only the important information on the composition and evolution of UHP metamorphic fluid/melt, but also insight into the metasomatism of fluid/melt at slab-arc depths. This paper presents an overview on the progress in the study of MS inclusions in UHP metamorphic rocks, with the emphasis on such outstanding issues as the formation mechanism, morphology and texture, mineral chemistry, trace element and fluid/melt origin.