Since the founding of the People’s Republic in 1949, the leadership of the party has been central to China’s political DNA. However, institutionally the system has gone through significant growing pains. At first, China adopted the Soviet system that separated, at least on the institutional level, the party and government. The top organs — the party central committee, the National People’s Congress and the state council were parallel. But in reality, the party led everything. This produced significant conflicts that some have blamed as partially responsible for the disastrous Cultural Revolution.
https://www.washingtonpost.com/news/theworldpost/wp/2018/04/02/xi-term-limits/?utm_term=.b7ce7b8800b4