The model effect and influence factors of microwave two - path propagation are studied. By applying electromagnetic wave and antenna theory，two path wave superposition formula is derived by using electric field amplitude and receiving power. The images of the relationship between the amplitude and the receiving power of the superimposed electric field and the horizontal distance of the antenna are given. The results show that when the two path microwave propagates，the electric field amplitude at the receiving point and receiving power with the distance between the antenna fluctuate. Antenna height and distance between antennas affect directly the amplitude of the received electric field and receiving power，but the influence of the distance between the antenna units is greater