Abstract: This article introduces classification of flow regimes and presents feature parameters for describing flow regimes. Subjection functions are constructed respectively according to feature parameters. Flow pattern recognization can be completed by colligating feature parameters. To evaluate the effects, the data obtained from experiments is repeatly applied in subjection function formula of judging flow regimes. The results show that sound effects can be obtained by application of fuzzy pattern recognization technique in judging flow regimes in a certain viscosity limit.