Abstract: To improve the energy efficiency of the communication system, a high efficiency orthogonal carrier modulation method is proposed. Energy efficiency is taken into account firstly in this method. Basedband pulse is designed based on prolate spheroidal wave functions (PSWF), which is orthogonal in the time domain and overlapped in the frequency domain, then modulated by the orthogonal carrier. The error rate and energy concentration degree are analyzed by theoretical study and simulation. The simulation result shows that the modulated signal energy concentration degree can be up to 99.8%, which is important to improve energy efficiency and reduce electromagnetic interference on other users.