Abstract: Photodissociation of NO2 in its second absorption band（B2B2 state）has been studied by monitoring the nascent NO X2Πproduct using the single-photon laser-induced fluorescence（LIF）technique. The rotational distributions of the nascent NO photofragment after photodissociation of NO2 at B2B2 state have been firstly reported. In v" = 1，the rotational distributions are bimodal. We proposed that there are two dissociation mechanisms that govern the product internal distributions and the photodissociation mechanism.