Abstract: The terpenoids play an important role in plant life events, and was in the large share of natural products. Many terpenoids were the key materials of plant allelopathy. Terpenoids are widely used in agriculture, industry, medicine and other fields. In view of this, the type, distribution, environmental impact, physiological and ecological functions, applications potential of terpenoid allelochemicals was summarized in the article. It were expected to provide the reference for its the research and applications for reference.