Abstract: Based on the application of seeker conformal phased array, a method of arbitrary conformal antenna pattern transformation from local coordinates to global coordinates is given firstly without the consideration of polarized information.Then a Ka band rectangular inset fed microstrip patch antenna which conforms to a conical surface has been designed and the antenna array is modeled, the direction vector is studied. At last, the pattern of array with 15 elements is optimized based on the formulation of maximum s directivity, the optimal weighted vectors are respectively given in the two constraint of sidelobe level and null point. The simulation result shows the mainlobe direction, sidelobe level and null point can be controlled.