Abstract: In this paper, by using fuzzy β-neighborhood and fuzzy logic operators, two ( I , T )-fuzzy rough set models were proposed with the help of fuzzy β-covering. The basic properties of upper and lower approximation operators in the models were studied. Then, the relationships between these two pairs of generalized fuzzy rough approximation operators and other fuzzy rough approximation operators were compared and analyzed. Finally, the equivalent conditions for approximation operators coincide with each other were described.