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We consider the following Chern-Simons equation, \begin{equation} \label{0.1}\Delta u+\frac 1{\varepsilon^2} e^u(1-e^u)=4\pi\sum_{i=1}^N\delta_{p_i^\varepsilon},\quad \text{in}\quad \Omega, \end{equation} where$\Omega$ is a 2-dimensional flat torus, $\varepsilon>0$ is a coupling parameterand $\delta_p$ stands for the Dirac measure concentrated at $p$. In this paper,we proved that the topological solutions of \eqref{0.1} are uniquely determinedby the location of their vortices provided the coupling parameter $\varepsilon$is small and the collapsing velocity of vortices $p_i^\varepsilon$ is slowenough or fast enough comparing with $\varepsilon$. This extends the uniquenessresults of Choe \cite{Choe2005} and Tarantello \cite{Tarantello2007}.Meanwhile, for any topological solution $\psi$ defined in $\mathbb R^2$ whoselinearized operator is non-degenerate, we construct a sequence topologicalsolutions $u_\varepsilon$ of \eqref{0.1} whose asymptotic limit is exactly$\psi$ after rescaling around $0$. A consequence is that non-uniqueness oftopological solutions in $\mathbb R^2$ implies non-uniqueness of topologicalsolutions on torus with collapsing vortices.

Uniqueness of topological solutions of self-dual Chern-Simons equation with collapsing vortices