In the process of production, processing and assembly of grating waveguide display system, due to the systematic error, cumulative error, and artificial assembly error of micro nano processing equipment, the imaging quality of the system will be affected, resulting in double image, blur, and other problems. In order to solve the above problems, this paper designs a one-dimensional pupil expanding grating waveguide, and uses the ray tracing simulation method to analyze the influence of grating waveguide parallelism error, grating period error, and system assembly error on the imaging quality. The imaging quality of the grating waveguide is processed and adjusted experimentally. By controlling the flatness of the waveguide within 0.3' and the grating period tolerance within 0.2 nm, a one-dimensional exit pupil extended grating waveguide is fabricated. After collimation and alignment, the 30 × 12° field of view angle is reached, good augmented reality display effect and clear imaging quality are achieved, which is of guiding significance for practical mass production.