Abstract: A new method using a cylindrical lens with two wedges to improve the uniformity of the line laser is provided to solve the problem of laser beam uniformly transmitting in the laser communication. The theory model of the optical system for the beam shaping was built with ZEMAX. The uniformity of the beam through the cylindrical lens is analyzed with the model at the different parameters (radius, angle between two slopes and the refractive index of lens medium). The result shows that the line laser with the uniform intensity distribution can be obtained by changing the cylindrical lens parameters under the condition of far field.