In order to strengthen the scientific protection and management of ancient trees, the ancient trees in Heyuan city were studied by the methods of interview estimation, literature tracking, tree age and DBH regression model estimation, etc. The results showed that: 1) the total number of ancient trees was 1995, mainly including the ornamental trees such as Castanopsis hystrix, Ficus microcarpa, Liquidambar formosana, Schima superba, Ficus concinna, Castanopsis carlesii, Celtis sinensis, Althingia gracilipes and Photinia davidsoniae, and economic trees such as Dimocarpus longan that can pick fruits. From the structural distribution characteristics. 2) The age of ancient trees is relatively concentrated, mainly belonging to tertiary ancient trees, with an average age of 195.56 a. 3) The distribution characteristics of ancient trees are obviously different, mainly concentrated in Dongyuan county, Heping county, Lianping county and Longchuan county, among which the countryside is the most dense. 4) Ancient trees are in good health on the whole, and some of them are weak and dying due to insect pests and construction disturbance. 5) The growth status of ancient trees was better and the results of correlation analysis showed that there was a significant positive correlation between tree height and DBH, tree height and crown width, and between DBH and crown width of ancient trees in Heyuan city (P<0.01). According to the study, the scientific protection of ancient trees should be carefully controlled according to plant types, plant ages, cultural regions, health conditions and growth conditions.
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