In the context of long-distance communication in atmospheric channels, the Gaussian light beam is impacted by atmospheric turbulence, leading to the problem of low energy coupling at the receiver. In order to solve this problem, a highly efficient coupling method for Gaussian beam spatial transmission in turbulent atmospheric channels is proposed. This method takes into account the distribution characteristics of Gaussian beam intensity and scintillation index. By monitoring statistical values of intensity and scintillation index as feedback, the emission end is controlled to suppress turbulence-induced intensity scintillation, achieving efficient coupling of the optical beam and enhancing communication system performance. Validation was conducted through a 1 km laser communication experiment. The results indicate that after adjusting the terminal based on scintillation monitoring, the average optical power increased from 19.63 μW to 24.91 μW. The scintillation index decreased from 0.140 to 0.088, and the communication bit error rate dropped from 1.27E-6 to 1.07E-10. Under weak turbulence conditions, the communication bit error rate decreases by four orders of magnitude. This way effectively enhances the performance of atmospheric laser communication systems, laying the foundation for the widespread adoption and application of atmospheric laser communication systems.