This study evaluated the situation and of the maintenance of the green open space as an example of Maebashi-city in order to consider the policy. The results were as follows; (1) It clarified the questionnaire survey of inhabitants by the evaluation about the green open space to have got the situation that was higher in the merger district area than the before merger district area. (2) It clarified the relationship between "the satisfaction of green open space" and "the evaluation of green open space" in the model by the regression analysis. Particularly, Authors found the important the factor which the green open space of the farm village, the green open space of huge tree group, the green space of history, and the green space of undeveloped woodland near populated area. (3) About the importance of the green policy, authors compared to the before merger district area and the merger district area at same time they compared 60 years of age more and less than 60 years old. The result, the merger district area was able to grasp the tendency that regarded eco-systemic of the green open space as important than the before merger district area.