This study clarifies Yasuhei Nagaoka’s design concepts by examining specifications for six of his parks. It compares the parks by extracting the focus of the design policy and instructions and classifying both the instructions and the intentions for those instructions. Instructions were able to be classified into seven types, and intentions for instructions were able to be classified into eight types. These analyses clarified the idea that Nagaoka regarded how visitors would use the park as the most important consideration while respecting the natural landforms and view. He also took into consideration the scenic beauty and convenience as well as making artificial elements inconspicuous, if possible, when designing park facilities. The importance of enjoying scenery or using park facilities changes the design specifications, depending on the location and history of the park. The comparison of specifications for six parks enabled a cross-sectional and concrete verification. This study provides a new understanding of Nagaoka’s thoughts about park design.