The online introduction is that the registration system for post certificate training and examination in the construction field is in charge of the Ministry of Construction. In order to implement the spirit of "Opinions of the Ministry of Housing and Urban-Rural Development on Implementing Professional Standards for Professionals in the Field of Housing and Urban-Rural Construction", realize the national unified professional standards, unified evaluation outline and unified certificate style, solve the problem of repeated examination and certification for inter-provincial mobile professionals, safeguard the legitimate rights and interests of professionals, and provide a one-stop network service platform for registration, training and certification.