An asymmetric dioxazine compound represented by the following formula (I) in the free acid form: ##STR1## wherein A.sub.1 and A.sub.2 independently of one another are each sulfo, halo, alkyl or alkoxy, W is an unsubstituted or substituted aliphatic or aromatic bridging group, X.sub.1 and X.sub.2 independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R.sub.1 and R.sub.2 independently of one another are each hydrogen or unsubstituted or substituted alkyl, R.sub.3 and R.sub.4 independently of one another are each hydrogen, halo, alkyl, alkoxy or unsubstituted or substituted amino, Z is a fiber-reactive group, m and n independently of one another are each 0 or 1, provided that m.noteq.n, and l is 1 or 2. This compound is suitable for dyeing and printing cellulose fiber, natural and synthetic polyamide fibers, polyrethane fiber, leather and the like and mixed yarns thereof, to obtain dyed or printed products of a color fast to light, wetness and chlorine with superior build-up and level dyeing properties.