随着信息时代光谱分析技术的飞速发展，光谱仪器的高精度、低干扰、体积小型化等性能优势使其成为各领域各行业的优选信息获取手段。本文以光学设计的基本原理为指导、中阶梯光栅为核心、宽波长范围和高分辨力为设计目标，设计了一种基于切尼尔-特纳型光路结构的小型中阶梯光栅光谱仪系统。通过理论分析和计算，确定了系统的结构参数，并使用Zemax 软件进行光学仿真。结果表明，该系统在200～800 nm 的波段上理论分辨力优于0.1 nm。

With the rapid development of spectral analysis technology in the information age, spectral instrument becomes a preferred access to information in various fields for its performance like high precision, low intrusion and small form factor. With the basic theory of optical design as guidance, echelle grating as key part, high resolution and wide detection wavelength as design target, a small size echelle spectrograph based on Czerny-Turner optical structure is designed. The structure of the system parameters is obtained based on the theoretical computation, and the optical system is simulated by the optical design software Zemax. The design results show that the theoretical resolution of the system, which works in the spectrum range from 200 nm to 800 nm, is better than 0.1 nm.