1975 Constitution of the People's Republic of China

The National People's Congress adopted amendments to the PRC Constitution on January 17, 1975. 

January 17, 1975

Constitution of the People’s Republic of China 1975  | Constitution of the People’s Republic of China 1978 | Constitution of the People’s Republic of China  1982 (amended through 2004) | 1988 Amendments |1993 Amendments  | 1999 Amendments | 2004 Amendments  | 2007 Resolution on Amendments2012 Revised Constitution 2017 Resolution on Amending the Constitution

The text is in the attachment below. 
The preamble to the constitution includes:

"We must adhere to the basic and policies of the Communist Party of China for the entire historical period of socialism and persist in continued revolution under the dictatorship of the proletariat, so that our great socialist motherland will always advance along the road indicated by Marxism-Leninism-Mao Tsetung Thought."