Abstract: The Zeeman Modulation Spectroscopy technique was used to measure the spectrum of NO₂ in the visible region between 16840cm^-1 and 16860cm^-1. Comparing with the zero-field absorption spectrum, it could give simplified rotational structure which is greatly useful for the assigmments of NO₂ complicated spectrum. The principal feature of Zeeman Modulation spectrum was also discussed in this paper.