A Iactobacillus beverage containing galactosylsucrose(LS) wasin gested by healthy female students with constiopation tendencies,and its influence on the defecation and fecal conditions wereinvestigated.The test was conducted in five periodicalstages.First,the subjects were allowed to ingest a lactobacillusbeverage free of LS everyday for aweek (Control period), and thenfor the next one week,the subjects were not allowed to ingest anylactobacillus beverages. Following the washout perid, the subjectswere allowed to Ingest a lactobacillus beverage containing LS(2.5g)everyday for continuous two weeks(LSIW and LS2W periods), and thenfor the next one week, the subjects were not allowed to ingest anylactobacillus beverages. During the LS ingestion periods,defecation times and days are increased significantly (P＜0.05) andfecal form are also improved significantly(p＜0