The offshore net enclosure is usually located in open sea and affected by the wave and current obviously. It is necessary to carry out study on hydrodynamic characteristics for the safety of the net enclosure. Herein, a kind of float-type net enclosure is chosen to analyze the resistance characteristics of net enclosure through towing tank experiment. A numerical model of the net enclosure structure in wave is developed based on the finite element method, and then the maximum displacement of the float and the tension of net are studied through computer simulation. The results show that the resistance of the net enclosure increases with the velocity of flow. There is a power function relationship between resistance and velocity. The maximum resistance is 196 kN. The displacement of the float at the midpoint of head line is the maximum when the float-type net enclosure is under wave. The maximum displacement is 80mm. Furthermore, the tension of the net at the points where the net connects with the mooring line and the lower four corners is greater. It is suggested to increase the buoyancy of net at incident flow side to maintain the shape of the net enclosure under high speed flow. Moreover, the net where the mooring line connects with the lower four corners should be reinforced in the production of actual net.