A modifioation of the synthesis of orown ether(1,4,7,1O-teraoxaoyclotrideoane-11,13-dione and 1,4,7,10,13-pentaozaoyolohegadeoane-14,16-dione) by continuous flow mothod is described.As compared with the static Methodism,the reaction time of the now method is much shorter and the yield is slightly higher.