By chiseling a BOL on a surface of a lens, a apochromatic system is composed, which actualizes the system's apochromatism, as well as revising primary aberration.

并将元光学在透镜的表，在校正系统初级像的同时，实现系统的复消色。

The principle of secondary spectrum is introduced and the equations of designing apochromatism objective lens based on wave aberration are presented.

介级光谱的基本原理,给出波法设计复消色物镜的方程组。