Humans naturally recognize and respond to environmental changes, known as ecological intelligence. The discussion on ecological intelligence started in the early 19th century and is still at the conceptualization stage. Several researchers have defined ecological intelligence based on its characteristics and assessment scale. Currently, the discussion of ecological intelligence is considered too general and broad, which can lead to a wide range of perceptions. This literature study review aims to classify ecological intelligence into several dimensions to make it easier to understand the concept of ecological intelligence today and its future development. The literature review above shows that ecological intelligence can be categorized into 3 (three) dimensions, namely cognitive, behavioural and technological, so ecological intelligence can be understood based on basic human mental abilities, actions and reactions and decision selection in determining appropriate technology.