For the infrared-laser composite seeker, the seeker fusion algorithm is studied in the simultaneous working period of the dual-mode detector. For the purpose of obtaining the control parameters under simultaneous control, make full use of the advantages of different detection performance, according to the difference of different single-mode sensors in the target recognition and tracking process under the same environment, give full play to the advantages of the same control mode information fusion algorithm, and study the information fusion process and algorithm of the multi-mode compound guidance system based simultaneous control, laying the foundation for subsequent engineering applications.