Abstract：Otavite was discovered as early as 1951, but the present discovery of this mineral in the Nuwjiaotang cadmium-zinc deposit, Guizhou, is probably the first report of its discovery in China. Otavite grains are very tiny in size, being commonly only several microns, and the large ones are several tens of microns. It often occurs as loose aggregates, crustified veins or films in association with smithsonite and greenockite in the Nuwjiaotang cadmium-zinc deposit. This discovery fills up the blank of mineralogy in China. Otavite has great significance in the environmental protection.