The coupling characteristics of light- wave between two symmetrical circular areas in the twodimensional ZnO random scattering particles are studied. The distribution of the optical filed and the spectrogram of mode in two-dimensional random scattering particles system are numerically simulated and compared by using the finite difference time domain (FDTD) method, when the distance D between the two symmetrical circular areas changes. The dependence of the emission intensity and the center wavelength on D is analyzed and it is obtained that the wavelength with 380.57 nm and the intensity of laser with 4.81 × 10⁴ are the optimal parameters while D = 0.8 μm. In ideal conditions, the optical field distribution of scattering system is observed during the simulation process. The result shows that the electric field intensity between two circular areas is amplified after coupling. With the increasing of D which is the distance between the circular regions, the electric field intensity is enhanced, the spectral line width is decreased, and the number of modes is reduced.