Abstract: In order to solve the problem of worse angel estimation which caused by the power being transmitted dispersedly in traditional multiple-input multiple-output(MIMO) radar, a new method for pattern synthesis of MIMO radar is proposed. Firstly, the optimal model is constructed based on second-order cone programming (SOCP) by combining the focus range of the transmit power with the rotational invariance of the transmit steering vector. It can not only constrain the optimal error less than the given value, but also can minimize the peak side lobe power of the transmit pattern. Further, the diagonal elements of the covariance matrix are constrained, which can maximum the power efficiency. Moreover, the SOCP form of the optimal model is given so as to use the primal-dual interior point method effectively. Lastly, simulations illustrate that the beam weight matrix can make the transmit power focus within the desire space and constrain the transmit array power to be equal, which is propitious to the energy usage. Therefore, the angle estimation performance by using the proposed method in this paper is better than the traditional MIMO radar when the transmit power and angle estimation method are same.