The glowing image of China’s top leader, Xi Jinping, greets visitors to museum exhibitions celebrating the country’s decades of growth. Communist Party biographers have worshipfully chronicled his rise, though he has given no hint of retiring. The party’s newest official history devotes over a quarter of its 531 pages to his nine years in power.

No Chinese leader in recent times has been more fixated than Mr. Xi on history and his place in it, and as he approaches a crucial juncture in his rule, that preoccupation with the past is now central to his political agenda. A high-level meeting opening in Beijing on Monday will issue a “resolution” officially reassessing the party’s 100-year history that is likely to cement his status as an epoch-making leader alongside Mao Zedong and Deng Xiaoping.

While ostensibly about historical issues, the Central Committee’s resolution — practically holy writ for officials — will shape China’s politics and society for decades to come.

The touchstone document on the party’s past, only the third of its kind, is sure to become the focus of an intense indoctrination campaign. It will dictate how the authorities teach China’s modern history in textbooks, films, television shows and classrooms. It will embolden censors and police officers applying sharpened laws against any who mock, or even question, the communist cause and its “martyrs.” Even in China, where the party’s power is all but absolute, it will remind officials and citizens that Mr. Xi is defining their times, and demanding their loyalty.

“This is about creating a new timescape for China around the Communist Party and Xi in which he is riding the wave of the past towards the future,” said Geremie R. Barmé, a historian of China based in New Zealand. “It is not really a resolution about past history, but a resolution about future leadership.”

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Mr. Xi “sees history as a tool to use against the biggest threats to Chinese Communist Party rule,” said Joseph Torigian, an assistant professor at American University who has studied Mr. Xi and his father. “He’s also someone who sees that competing narratives of history are dangerous.”