Abstract: The leaf morphological structure of 22 species, 2 varieties and 1 form of the tribe Vicieae in northeastern China were studied in depth using SEM, leaf transparency and GMA methods. The leaf is an even pinnate compound, with one to several pairs of leaflets which are usually ovate in shape. The anticlinal walls of leaf epidermal cells are usually sinuate. The anisocytic stoma is the main type of Lathyrus and Pisum, and the anomocytic type mainly occurs in Vicia. Unicellular, non-glandular hairs and multicellular, glandular hairs occur on the leaves of many species of Vicieae. The petiole is hastate in transverse section and has a groove on the adaxial side. There are several vascular bundles which are arranged in V-shaped, heart-shaped or round patterns in the petiole. This study provides morphological data for distinguishing between the different groups of Vicieae in northeastern China. It also provides the morphological basis for systematic and phylogenic studies of the family Leguminosae.