Abstract: Treemaps are popular visualization methods for hierarchical data with visually encoding the hierarchical property by containment.Because of their space efficiency and interactivity,Treemaps have been deeply investigated and many variations have emerged.The techniques have also been widely applied in many areas,including scientific,engineering,social,educational and commercial fields.In this survey,we summarize both basic and state-of-the-art researches on Treemaps,including layout algorithms,interaction methods,extensions and variations,applications and user evaluations.Discussion on the future research direction of Treemaps is also presented in this paper.