We discovered a new gas-condensate reservoir named Fujikawa III Layer in Fujikawa gas field (Niigata Prefecture) last spring (1971). The production test of the discovery well, Fujikawa SK-16D, was planned to evaluate the reserves and its physical properties of this reservoir. The build-up tests and the drawdown test for a long period, 3 months, were performed. This report is the results of the interpretation of these production tests. We have found this reservoir is a rather small size reservoir and the distance from the well to the nearest boundary of the reservoir is about 400m.