The attractive effect of 3 fish reef models of different diameter on black porgy with behavioral analysis method is studied. Results show: 3 kinds of fish reef model have obvious attractive effect on black porgy. After the model is put in the pool, distribution ratio of fish in the reef region increases obviously, centre of gravity of colony moves around the model, average distance between individual fish decreases compared with non-reef condition. Variance analysis shows: there is no obvious difference in the attractive effect of 3 kinds of fish reef models, and black porgy shows obvious gather-taxis reaction to the fish reef model of different diameters.