  We present a star cluster population study in the interacting galaxy system
M51 based on HST ACS BVI mosaic images taken by the Hubble Heritage Team to
commemorate the HST's 15th anniversary. We have found and classified star
clusters in M51 using SExtractor and visual inspection. We have derived the
photometry, size, and age of the clusters. It is found that the companion SB0
galaxy NGC 5195 harbors about 50 faint fuzzy clusters and that the age
distribution of star clusters appears to be correlated with the epochs of
dynamical events in M51 system.
