Wet process, a conventional method for mung bean starch preparation, may cause about 80% protein loss in wastewater. In this study, ultrafiltration(UF} was used to recover the protein from the simulated wastewater of mungbean starch processing. 40·C and 4 kg/cm 2 were found to be the appropriate condition for operation. Recovery of protein was 87.8% and 50.3% for mo I ecu I a r we i gh t cu t -0 f f ( MWCO) 30,000 and 500, 000 membranes respectively. Protein remained in the wastewater could almost be separated by UF with the MWCO 30,000 membrane. It seems feasible to recover the protein by UFo This would not only prevent contamination but also improve the utilization of mungbean.