Background: Diabetic patients with poor health behaviors are at greater risk for a range of adverse health problem. Diabetes foot problems can be avoided by practicing self-care. Study aim: evaluate the impact of health intervention about foot self-care behavior among adult and elderly diabetic patients'. Subjects and Methods: Quasiexperimental design pre and late posttest was applied in Internal and the outpatient clinic at main Assiut university hospital. The sample size: This study included purposeful sampling, with a total of 80 diabetic participant. Data collection tools: Interviewing questionnaire included personal characteristics, medical data, Diabetic Foot Self-care behavior scale and Health Intervention through International Working Group Diabetic Foot. Results: Mean ±SD of Diabetes Mellitus duration was 10.7 ±8.2 years, significance difference between the total score of foot self-care behavior in pre and late posttest with a mean ± SD (42.8 ±6.96 and74.04±29.11) respectively. Also, between selfcare behavior of the studied sample and their knowledge level in pre & late posttest (P. value= 0.061 & 0.001) respectively Conclusion: Health intervention have a positive significant impact on the studied sample self- care behavior regarding diabetic foot. Recommendations: Provision of comprehensive foot care and intervention for diabetic patients with foot ulcers in order to avoid complications.