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The study and comparison of the natural diversity of lichens in the rainforest and native forests in Thung Khai Botanical Garden ,Yan Ta Khao District, Trang Province are to 1) study the types of lichens and the natural diversity of lichens in the rainforest and native forests in Thung Khai Botanical Garden, Yan Ta Khao District, Trang Province 2) compare the types and natural diversity of lichens in the rainforest and native forests in the Local areas of the Thung Khai Botanical Garden, Yan Ta Khao District, Trang Province by setting up sampling points for lichens in native forests and tropical rainforests, studying the types and characteristics of lichens that lichens were divided into 3 groups such as the highly durable group, the hardy group, and good weather group. It was found that there are 1 3 types of lichens, commonly found in rainforests and native forests, including Amandinea extunate , Anthracothecium ,Pyxine cocoes , Cryptothecia , Dirinaria ,Graphid , Glyphis & Sacographa , Laurera benguelensis, Lecanaro, Arthonia, Chrysothrix, Trypethelium tropicum , Parmotrema tinctorum. There are 2 types of lichens that are found in native forests but not they are found in rainforests: Physcia dimidiata , Trypethelium eluteriae. Moreover, there are 3 types of lichens that are found in the rainforest but they are not found in the native forest: Rinodina , Parmotrema praesorediosum and Fruticose lichen. The rainforest is a deciduous forest. It is a forest that is green all year long. There is quite a lot of rain. It is highly fertile. Therefore, the types and natural diversity of lichens are found more than in native forests, which is a forest ecosystem. Moreover, the rainforest has good air lichen species, which are more indicators of good air quality than native forests.