Introduction: diarrhoeal disease is the second leading cause of malnutrition and death in children under five years old. Effective home management of acute childhood diarrhoea with oral rehydration solution (ORS) and zinc is the immediate and best applicable step under the local circumstances to minimise the morbidity and mortality. Objective: To determine the pre-test knowledge level of mothers regarding use of Zinc supplementation with ORS in managing diarrhoea among under five children. To determine the effectiveness’ of information booklet on Zinc supplementation with ORS in managing diarrhea.To find the association between mean pre-test knowledge score with demographic variables. Methodology: Study was undertaken on purposively selected 40 mothers having at least one under five Child. Pre experimental one group pre-test post-test design and evaluator approach was used. Tool for data collection included demographic Performa and structured knowledge questionnaire. Results: Mean Post-test knowledge score (20.33) was higher than the mean pre-test knowledge score (11.95).The computed‘t’ value (13.60) was higher than the table value (t₃₉=1.64, p< 0.05).there was association between knowledge level and education at 0.05 level of significance. Conclusion: this study indicates that information booklet is an effective strategy for providing information and improving knowledge of mothers.