During the first state-to-state cooperation, farmers' associations were organized to negotiate with landlords and squires to safeguard the legitimate rights and interests of farmers. Ten years of civil war, fighting local tyrants, dividing fields and establishing revolutionary base areas. During the War of Resistance against Japanese Aggression period, in order to unite all forces that can be United, landlords adopted the policy of reducing rents and interest rates, and farmers paid rents and interest, and launched a large-scale production campaign of "do it yourself and have plenty of food and clothing" by the military and civilians to save themselves. The war of liberation began to wipe out the landlord class completely. After the transformation of the commune, the land belongs to the collective. After the reform and opening up, a land policy based on the household contract responsibility system was gradually formed.