China's ruling Communist Party is expected to amend its constitution at a key party congress next month, state media said on Monday, in a sign that President Xi Jinping aims to enshrine his guiding ideological doctrine in the charter.

Since assuming office almost five years ago, Xi has rapidly consolidated power, with moves such as heading a group leading economic reform and appointing himself military commander-in-chief, although as head of the Central Military Commission he already controls the armed forces.

The Politburo, one of the party's elite ruling bodies, deliberated a draft amendment to the constitution to be discussed at the congress that would include "major theoretical viewpoints and major strategic thought," the official Xinhua news agency said.