In accordance with the provisions of the Constitution, NPC sessions are held annually and are convened by the NPC Standing Committee.

In line with the Rules of Procedure, the NPC session is held in the first quarter of the year. This facilitates the examination and approval of the state budget for the year and consideration of the report on the implementation of the previous year's budget. The first plenary session of each new NPC is convened by the Standing Committee of the outgoing NPC. The deputies to the new NPC will have been elected less than two months previously.