The stomatal density on abaxial epidermis of the second wheat(Triticum aestivum L.) leaf increased step by step from the leaf base to its tip. On adaxial epidermis, this increasing tendency was generally maintained, but close to both the base and the apex two maxima were determined. In the direction perpendicular to leaf length, maximum stomatal density was close to the edges, and minimum one was in the central part of the leaf blade.