Gravity and geomagnetic field are the main references of aircraft attitude measurement, and their shortcomings in high acceleration environment are hard to overcome.In this paper, the 3D structure vector of electromagnetic wave is taken as the reference of aircraft attitude measurement.According to the relationship between the attitude of airborne electromagnetic vector receiving array and the received electromagnetic signal, the steering vector is established.MUSIC algorithm is used to search the attitude parameters in 3D to maximize the signals spatial spectrum, so that the attitude estimation of aircraft platform is realized.Since excessive computation of MUSIC algorithm will cause slow attitude estimation, an improved Genetic Algorithm (GA) is applied to spatial spectrum search.Simulation results show that the algorithm speeds up attitude estimation while ensuring the accuracy and stability.