  In the present paper, we study the existence and optimal controllability of a
multi-term time-fractional stochastic system with non-instantaneous impulses.
Using semigroup theory, stochastic analysis theory, and Krasnoselskii's fixed
point theorem, we first establish the existence of a mild solution. Further, we
obtain that there exists an optimal state-control pair of the system. Some
examples are given to illustrate the abstract results.
