Abstract: This paper studies the estimation of the target position and velocity in the passive multiple-input multiple-output (MIMO) radar, we control the number of illuminator of opportunity selected at the receiver to satisfy the limited system complexity requirement. The selection variables for the illuminator of opportunity are introduced into the signal model, based on which, the optimum receiver and the Cramer-Rao bound are derived. With the bound as a metric, we consider the illuminator of opportunity selection, the receiver deployment and the joint illuminator of opportunity selection and receiver deployment optimization, which are shown to be the integer, continuous and mix integer optimization problems respectively. Numerical examples shows that, under the case of limited complexity, all optimization approaches improve the system estimation performance, while the joint optimization tends to be the best.