Purpose: This study was to present the effects of home visiting health service on hypertension and DM clients. Method: The one-group pretest-posttest design was applied to 127 hypertension and 116 DM clients. To evaluate the effects of visiting nursing service, biological indexes and self-care abilities were measured from April to July, 2007. Result: Biological indexes and self-care abilities were improved in the hypertension and DM clients who received visiting nursing service. Especially, blood pressure and fasting blood sugar showed a dramatic decrease. Conclusion: Home visiting health service by public health centers is considered to be an effective nursing service in Gangwon-do. Therefore, case management is demanded not only for hypertension and DM but also for other chronic diseases.