In this paper, we consider the following nonlinear Schrödinger system involving the fractional Laplacian operator:
where . When Ω is the unit ball or , we prove that the solutions are radially symmetric and decreasing. When Ω is the parabolic domain on , we prove that the solutions are increasing. Furthermore, if Ω is the , then we also derive the nonexistence of positive solutions to the system on the half-space. We assume that the nonlinear terms f, g and the solutions u, v satisfy some amenable conditions in different cases.