In Japan, there are many precedents in park making for citizens to participate in, but none of them have a strong connection with the actual use of the park, and it is only the imagination of activities, so there may be a difference from the completion. Therefore, in the future, it is necessary to update the design by repeating the experience of citizens using it and trying it, and by sympathizing with their opinions, "I want to use it". The purpose of this study was to build a public participation method of park building, and four workshops were held in the basic design stage for the new urban park improvement plan in western Maibara, Shiga Prefecture. As a result, the extracted opinions could be translated as '49 Thoughts' and reflected in the blueprint, and eventually the design could be updated by citizens experiencing the planned site. Based on the above, it is expected that a method that can be implemented in the plan by extracting in-depth information such as location and facilities used and superficial information such as citizens' requests has been established.