624 pea genotypes sampled from a world collection of various geographical origins were evaluated based on 20 morphological traits, to create initial knowledge with better understanding of their genetic diversity, and to provide useful information for variety improvement in pea breeding programs. Large genetic variation among geographic origin based groups of genetic resources were revealed by comparison of mean value, CV, genetic diversity index of their 20 morphological traits. Two gene pools, a Chinese gene pool and a oversea gene pool, were detected and defined by three-dimensional PCA graph method. Genetic distance based UPGMA clustering analysis provided the same results for support. The research results testified the reliability of morphological traits based genetic diversity analysis.