Abstract: The date rate to bandwidth ratio is one of the most important parameter of a communication system in band limited channels. For improving the date rate to bandwidth ratio of the nonsinusoidal orthogonal modulation system in time domain, a new efficient nonsinusoidal modulation method is proposed based on the ternary coding. By converting the serial binary data stream into parallel ternary ones and mapping with three phases of corresponding orthogonal pulses, each symbol can carry more information, so the date rate to bandwidth ratio can be increased. The modulation and demodulation models are proposed and the performance of data-rate-to bandwidth ratio and the bit error rate are derived theoretically. The comparing and simulation result shows that the proposed method can increase the date rate to bandwidth ratio with the cost of the signal to noise ratio not more than 0.3 dB. The proposed method can be used in the condition with high transmission rate in band limited channels and helpful for reducing the complexity of realization.