Purpose: The purpose of this study was to explore support methods by public health nurses for encouraging behavioral change and sustainability for healthy lifestyle of persons at high risk of lifestyle-related diseases. Method: The subjects were four local government public health nurses. The data was collected by semi-structured interview on the support methods by the nurses, which was to clarify intention, contents, target of encouraging behavioral change and sustainability for healthy lifestyle support for high-risk persons. Interview transcripts were analyzed by using an inductive coding approach. Results: The support methods which consisted of 42 <sub categories>, nine <<categories>>, and two 【core categories】: 【Cultivating the power to appropriately adjust their own lifestyle】 consisting of <<Encouraging objective view of their own-lifestyle>>, <<Finding a way of behavioral change that matches the pattern of lifestyle>>, <<Developing an ability to experience effect of behavioral change>> and 【Advancing the ability to adjust relationship with surroundings】 consisting of <<Considering the views of the family on health and the view on life>>, <<Entertaining how to declare intention of behavioral change with people around one>> and <<To confer the role of healthy behavior>>. Conclusion: Support aiming at highly sustainable behavioral change, which is carried out by public health nurses, is set out 【Cultivating the power to appropriately adjust their own lifestyle】 and 【Advancing the ability to adjust relationship with surroundings】. Moreover, the supported high risk persons improved their own self-care skills and they were motived to willingly ameliorate their environment as factors in health promotion throughout their regions.