Micro-morphological characters of 21 species of Viburnum in China, including shape of leaf epidermis, size of stomata, type and cortical ornamentation of stomatal apparatus, and so on, was observed and measured under light microscope (LM) and scanning electron microscope (SEM), which provide foundation for phylogenetic study of Viburnum. The results show that there are 2 kinds of leaf epidermal cells classified as irregular and polygonal shapes, and 4 patterns of anticlinal wall, i.e., straight, sinuolate, undulate or sinuate, among which the shape of the abaxial epidermal cells was irregular, and the anticlinal wall pattern is more stable than those of the adaxial epidermal. In addition, the stomata were only distributed in the abaxial epidermal, with its shape being nearly round and oval. The types of the stomatal apparatus were anisocytic, paracytic and anomocyitc. Three kinds of inner edge of the outer arch cover of the stomatal apparatus, i.e., nearly smooth, sinuolate or undulate. Two shapes of stratum corneum on the periphery of the stomatal apparatus were observed, i.e., with ridge hunch, striped hunch.This study indicates that the characters of leaf epidermal cells and stomatal apparatus of Viburnum are different to a large extent, which can be served as one of the criteria to identify and classify species of Viburnum. The taxonomic significance of these micro-morphological traits in Viburnum was discussed in this paper.