When did China began shifting from Communism to Capitalism?

Starting in 1970, economy entered into a period of stagnation, and after the death of Mao Zedong, the Communist Party leadership turned to market oriented reforms to salvage the failing economy. The communist party authorities carried out the market reforms in two stages

Originating in the Chinese economic reforms initiated in 1978 that integrated China into the global market economy, the socialist market economy represents a preliminary or "primary stage" of developing socialism.