Practical function, 1, a stepping stone for passive house or ultra-low energy consumption or low energy consumption architectural design consultation; 2. If a building project is to obtain PHI certification, there must be personnel with PHI design/consultant certification qualification certificate to participate in design consultation. Otherwise, PHI will not give authentication; 3. Learn to use PHPP software and computing technology; 4, increase their own value, so that the gold content of self is higher; 5, under the same conditions, priority promotion or evaluation of senior titles.