In this study, I investigated the species composition in the Mulberry tree cultivation area from April 2013 to March 2014 at Busan. Five genera and nine species found are as follows: Aporrectodea caliginosa (Savigny, 1826), Bimastos parvus (Eisen, 1874), Eisenia fetida (Savigny, 1826), Drawida japonica (Michaelsen, 1892), Amynthas heteropodus (Goto&Hatai, 1898), Amynthas agrestis (Goto & Hatai, 1899), Amynthas corticis (Kinberg, 1867), Amynthas hilgendorfi (Michaelsen, 1895), and Amynthas sp. A total of 317 individuals of Aporrectodea caliginosa (Savigny, 1826) was collected. Ap. caligionosa and A. heteropodus were found to be the most dominant species during the study period. Interestingly, the maximum population density of Ap. caligionosa was recorded to be in the month of October. Further details analysis indicated that, its population increased rapidly during the breeding season between summer and autumn and thereafter gradually decreased through winter toward the following February. Three growth stages of Ap. caligionosa occurred almost simultaneously with abundance composition of 76% in aclitellum, 12.6% in semiclitellum, and 11.4% in clitellum. Based on my study results, I suggest that this data could be useful for the scientific community to analyze the distribution of southern earthworm species in mulberry tree cultivation area.