Background: The high number of pregnant women with Chronic Energy Deficiency at Puskesmas Kuwarasan, Kebumen District can increase the Maternal Mortality Rate and Infant Mortality Rate. One of the efforts made to reduce the number of pregnant women with chronic energy deficiency is the provision of supplementary foods in the form of biscuits and milk per day for 90 days. This study aims to determine the effect of the intervention of supplementary feeding on the nutritional status of pregnant women with chronic energy deficiency. Method: This research used descriptive-analytical method with a case study design. It involved 5 cases of pregnant women with Chronic Energy Deficiency. The nutritional status of pregnant women was measured using the mid-upper arm circumference indicator. Differences in nutritional status before and after the intervention were measured based on the mid-upper arm circumference. After the intervention with the provision of supplementary foods in the form of biscuits and milk for 90 days, the chronic energy deficiency issue was resolved as indicated by a change in nutritional status in pregnant women with chronic energy deficiency whose status changed to normal nutritional status. Result: The average value of mid-upper arm circumference increased from 21.8 to 23.82 cm. The Wilcoxon test obtained a p-value of 0.038 (there is a significant relationship before and after the intervention of supplementary foods for 90 days). Conclusion: Supplementary foods of biscuits and milk can improve nutritional status to normal..