Abstract：This study used 5 ISSR primer combinations to analyze genetic diversities among 105 celery（Apium graveolens L. var. dulce DC.）germplasm. The result showed that the cluster analysis based on ISSR data classified the celery germplasm into 5 major groups. In these groups，most of the samples（81.9 %）were gathered in group 2, indicating the collected germplasm with close blood relationship. The results of principle component analysis suggested that in China, celery cultivars include 2 categories which are the imported celery and Chinese celery. In Chinese celery categories, the white and solid celery have closer blood relationship, the white solid celery may be obtained from a genetic mutation of the solid celery. By principle component analysis and field observation, we divided the imported celery into 2 groups. The character of one group has longer growing period, with strong erectness and bolting tolerance, the other group has shorter growing period, with weak erectness and bolting tolerance.
