The present study proposes athe automated hauling system of a chamber net by means of compressing air into a flexible hose net beneath the chamber net in set net fishery. As a result of tank model test with a 1/100 scale model, the hose net rose like an S shape to corner fishes gradually. The fundamental knowledge on the relationship between the water current condition and sinking or floating time of the chamber net, the distance of the movement of the flexible hose net could be obtained.