There are 3 forest types within Phu Phan. Dry Dipterocarp is the most common covering 42% of the park. Dry everygreen is the second most common and is found mostly in the southern part of the park. Mixed Deciduous is a transitional forest type found between the Dry dipterocarp uplands and the Dry everygreen areas located next to water. The park was established to preserve the forest in this area

Topography
It is a limestone mountain and a water source such as Huay Hidlard, Huay Boon, Huay Kok, Huay Muang, Huay Hinpoon, Huay E-kon, and Huay Wangpla. Some areas are the grass field and very beautiful as well as the steep cliff.

Climate
Hot season runs from late January until May, with temperatures sometimes reaching into the 40's rainy season begins around June and goes on until October. The park receives an average of 1,550mm of rainfall per year. Cold season lasts from November until January with temperatures in the evening getting down to about 17C.

Flora and Fauna
There are at least 162 species of animals in the park, most of which are birds. There is one herd of wild elephants, but they are in an area with few trails and thus rarely seen. There are also monkeys, barking deer and wild pigs.