This descriptive cross sectional study was carried out among 394 purposively selected mothers in a rural area of Jakigong,Sylhet to study the status of knowledge, attitude and practice of mother on Oral Rehydration Salt (ORS) in diarrhoea. Data werecollected by face to face interview by using a semi structured questionnaire. About 68.3% mothers defined diarrhoeaappropriately and majority (88.8%) of the respondents used ORS till diarrhea cure. Among the respondents majority (93.4%)said right answer and rest (6.4%) of them gave wrong answer regarding amount of water use for ORS preparation. About 16.5%used boiled cool water, 11.2% used tap water and 72.3% were used tube-well water to dissolve packet ORS. Only 37.6%mothers use ½ liter water bottle for measuring of water. Although 33% knew that the prepared ORS could be used for 6 hoursand 28.4% didn't know about it. Most (82.7%) of the mother used handmade ORS when packed ORS were not available. About95.5% reported that ORS is good in diarrhea and 86% did not stop ORS feeding during diarrhea. About half of the respondentsconsult with their doctor, 47.7% feed at home and only 1.5% waits when their children suffer from diarrhoea and dehydration.About 58.6% did not stop ORS feeding during vomiting and 41.4% stopped it during vomiting. Among all the respondents72.1% used anti-diarrheal drug during diarrhea and 27.9% didn't use any drug. Awareness campaigns can improve the use ofORS and can pay regular visits by the health workers can improve knowledge, attitude as well as practice regarding the use ofORS among rural people.