Starting from the main object of the interior design that appears in the comfort and happiness and ease of movement and beauty of the residential buildings. This intersects with the principles of science Feng Shui, which leads to comfort and happiness by achieving the balance between the five elements (earth, water, fire, metal, wood) through clarifying the interrelations between them, and working to provide positive energy inside the building and decrease the negative energy.
Therefore, this research highlights on the definition of Feng Shui and clarifies the principles and components, and various schools and their interrelationships, for it's importance, and using the applying of its principles on building plans, especially residential. That is by what belongs to the interior design.