From the view point of entropy, the following problems should be considered for the study of architectural action. 1. The condition of keeping thermal equilibrium permanently in the open system of the earth environment to the space should be considered to restruct the architectural planning and architectural actions. 2. The industry of construction should be reconstructed not to use the stock of sunshine energy but to use the flow of it to get energy, products, materials, as much as possible. 3. Persons themselves should be change their life style and recreate architectural planning and architectural actions as to use the flow of the sunshine energy, and to reduce the increase of the entropy of the substance. 4. Human history, and urban planning and urban design which are in front of it, could be considered to have been pursuiting the realization of Utopia, under the condition of restriction of the second law of thermodynamics. 5. Even in the person-environment system, fundamental solution should be the reconstruction of mental welfare, and should be connected them to the economic activities including architectural planning.
