Developments in the production of 123Ⅰ by cyclotrons and electron accelerators were reviewed. Among many methods 124Te(P
2n)123Ⅰ
123Te(p
n)123Ⅰ
122Te(d
n)123Ⅰ
127Ⅰ(p
5n)123Xe→123Ⅰ
124Xe(p
x)123Ⅰ and 124Xe(γ
n)123Xe→123Ⅰ were discussed in detail.The advantages and disadvantages for each method were compared. A brief intyoduction of 123Ⅰ production in SINR was given.