Abstract: In order to promote the morphological study of Dryopteridaceae and Thelypteridaceae,the micromorphological characteristics of leaf epidermis of 10 ferns in Leshan Green Heart Park were observed by optical microscope,and the size,shape of leaf epidermis cells,type,size,index,shape and density of stomatal organ of10 ferns were compared and analyzed.The results showed that the epidermal cells of three species of Dryopteridaceae were irregular and irregular strip,the vertical wall was irregular concave convex and deep wavy,the maximum length width ratio of epidermal cells was 4.3,and the types of stomatal organ were mainly polocytic type and cellula axialis type;The shape of upper and lower epidermal cells of 7 species of Thelypteridaceae was basically irregular shape,and the cell length width ratio was similar.The vertical walls of epidermal cells of three Parathelypteris plants were mostly irregular concave and convex,three Cyclosorus plants were mostly deep wave concave convex,and one Macrothelypteris plant was irregular concave convex.The stomatal organ types of 7 species of Thelypteridaceae were mainly polocytic type,cellula axialis type,irregular type and unequal cell type.The stomatal organ types and stomatal density of the three genera of Thelypteridaceae show certain intergeneric differences.