Abstract: In case of Chern-Simons matter theories, the charged particle itself is regarded as the magnetic flux, then it exhibits a lot of "strange behavior" which will not be understood with our intuition based on the Maxwell equation. In this talk, we studied how such a "strange" feature of the Chern-Simons matter theory affects the usual S-matrix analysis. We have also studied the duality relationship between Bosonic system and Fermionic system based on the result of the S-matrix.