The period of validity of the construction engineer's qualification registration is generally 3 years. Three months before the expiration of the validity period, the holder shall go through the formalities of re-registration at the original registration management institution. In the period of validity of registration, if the practice unit is changed, the change formalities shall be handled in time. Re-registration, in addition to meeting the requirements of Article 18 of these Provisions, shall also provide proof of continuing education.