Abstract: By means of System Dynamics theory and approach, the SD research model on the coordinative development of the primary industries of Heilongjiang Provincial rural economy is established.The model: (1) Focus on the interactions, internal relations and the internal structures of each primary industry, the interaction between the primary industries and others in national economy. (2) Analysed quantitatively the developmental trends of the primary industries. (3) Provided a scientific basts for designing development strategies and policies.