AOTS organizes the Convention of the AOTS Alumni Societies by inviting Representatives of the AOTS Alumni Societies to gather once every four years in principle. The objectives of the Convention are to facilitate cooperation among the AOTS Alumni Societies and to promote the AOTS activities according to the actual situation of developing countries by obtaining information on evaluation of AOTS activities and local training needs of developing countries through the exchanges of opinions between AOTS and AOTS Alumni Societies.
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| No. | Year | Place | No. of countries and Societies | No. of delegates |
| 1st | 1986 | Tokyo, Japan |
28 Societies from 20 countries |
33 |
| 2nd | 1989 | Yokohama, Japan |
43 Societies from 25 countries |
103 |
| 3rd | 1992 | Bangkok, Thailand |
51 Societies from 31 countries |
132 |
| 4th | 1994 | Osaka, Japan |
53 Societies from 33 countries |
171 |
| 5th | 1997 | Aichi, Japan |
64 Societies from 40 countries |
205 |
| 6th | 2002 | Colombo, Sri Lanka |
61 Societies from 37 countries |
136 |
| 7th (PDF:1.48MB) |
2006 | Mumbai, India |
62 Societies from 40 countries |
170 |
| 8th | 2009 | Yokohama, Japan |
68 Societies from 41 countries |
211 |