Abstract: The sensitivity analysis on the DEADA model with L-R fuzzy numbers (FDEADA model) was discussedaccording to the twostage procedure of DEADA. We presented the sufficient conditions for thediscriminant result of FDEA-DA model being invariable on new decision making units increasing. We also deducedthe conditions that the increased dec ision making units will satisfy for the discriminant result keeping invariable and the optimal solution being consistent before and after increasing decision making units.

Key words: L-R fuzzy number, DEA-DA model, sensitivity analysis, discriminant function, the optimal solution