Abstract: The concept of (U,V)intervalvalued fuzzy biideals was introduced in semigroups, and its basic properties were discu
ssed. The author gave the relations between (U,V)intervalvalued fuzzy biideals, fuzzy biideals and intervalvalued fuzzy biideals of semigrous, proved that the intersection of (U,V)intervalvalued fuzzy biideals was still (U,V)intervalvalued fuzzy biideals of semigroups, and discussed the correlation properties of direct product of (U,V)intervalvalued fuzzy biideals of semigroups.

Key words: semigroup, (U,V)intervalvalue,  , fuzzy biideals, direct product