Abstract: Pollen morphology of 2 Genus, 14 species, 2 varieties and 1 form of Geraiaceae in Northeastern China was investigated. And the key to species of Geraniaceae was done. The results showed that there are two types of pollen graino. (1)3-colporate. Sculpture pattern of exine tuberculate (Geranium), (2) 3-colpus. Sculpture pattern of exine reticulate (Erndium). In the taxonomy of Geranium. the size of pollen grain. length of colpus, even degree of exine tectum. lumina diameter. ornament on the muri and even degree of tubercles of exine sculpture, size, sculpture pattern on the tubercle vary with each taxon. And the taxonomy of pollen morphology of Geraniaceae reached a consensus with the classiacl systematics of this family.

Key words: Geraniaceae, Pollen morphology, Systematics