Abstract: Perkin reactions under phase transfer catalysis of poly(ethylene glycols)(PEG) were studied. It was shown that PIGgave a obvious catalylical effect on the reactions. PEG-600 of average molecular weight were more efficient than the others examined. The yields of Perkin reactions with PEG-600 were higher than that without it by 10%. Morever, the reaction time was shortened remarkably. Appropriate amount of PEGused in the reactions was ca. 1% (mole).