In the rapid development of wireless communication technology, Quadrature Amplitude Modulation (QAM) has become a key modulation technique in the fields of satellite communication and mobile communication. The research on reducing the Bit Error Rate (BER) which is a core indicator for evaluating the reliability of wireless communication systems is particularly important. To optimize QAM technology and reduce BER, an improved method of QAM is introduced. The core of this method lies in transforming the two orthogonal carrier signals in traditional QAM technology into three pseudo-orthogonal carrier signals within the same frequency band. After modulation, these three carrier signals are superimposed with a digital signal. Through this design, the amount of data carried by each signal is reduced, thereby maximizing the minimum distance between any two points in the three-dimensional space constellation diagram. This change not only enhances the noise tolerance but also effectively reduces the system's BER. To verify the effectiveness of this improved method, it is simulated and compared with Phase-Shift Keying (PSK) and traditional QAM. The simulation results show that the proposed three-channel QAM method is consistent with the expected performance, verifying its feasibility and advantages in practical applications.