After the founding of the People's Republic of China, in the late 1960s and early 1970s, in order to carry out class education activities, similar to the campaign of complaining of bitterness and sweetness of remembrance also sprang up across the country, so that the bitter old poor peasants complained about the bitterness of the old society, thinking about the hard-won happiness of life in the new society and with the remembrance of bitterness and sweetness of eating rice and other activities in order to arouse people's ideological awareness, to achieve the purpose of educating the future generations.

The Chinese People's Liberation Army (PLA) carried out a form of class education, which was widely used in the Third Domestic Revolutionary War. By accusing the old society and the reactionaries of the suffering given to the working people, the troops were made to recognize the enemy, hate the enemy, unite as one and kill the enemy valiantly. This campaign effectively raised the class consciousness and fighting strength of the troops, and played a significant role in uniting themselves and defeating the enemy.