Abstract: Morphology of mesophyll cells was studied for some important species of bamboos distributed in Fujian province by Tuan's method of separating cell and microphotography.It is found that most of the mesophylI cells of bamboos are differentiated into complex cells with peaks, dales, isthmus and rings.Mesophyll cells of bamboos are in various shapes. Roughly, these cells can be divided into three types. The first, mesophyll cells have rings on one side; the second, rings on both sides (symmetric or asymmetric); the third, are in irregular shape.Mesophyll cells of leaves on the top of crown are larger than those of leaves on the lower part of crown for the some plant.It is showed that there are some variations in the area of surface and rings between individul cells for some species, and also cultivated species with monopodial rhizome and inflorescence have larger mesophyll cells than the wild with sympodial rhizome and pseudoinplorescence.