Abstract: To deal with low sidelobe transmit pattern design problem for MIMO radar, a new minimum peak-sidelobe or integrated-sidelobe transmit pattern optimization algorithm is proposed in this paper. Due to the optimization problem of minimizing peak-sidelobe or integrated-sidelobe is non-convex, it is solved in two steps by the proposed algorithm. A convex problem is solved in the first step, and in the second step, the global optimum of original problem is attained by scale transformation of the solution in the first step. The simulations show that the transmit pattern have lower peak-sidelobe or integrated-sidelobe with this algorithm than existed algorithm.