The theoretical model of the multiple micro-channel parallel flow condenser was established based on the method of distribution parameters, and the validity of the model was verified by comparison with the experimental data. Based on this model, the effects of flat tube inner hole numbers, proportion of height and width of the inner hole, flow paths arrangement, flat tubes distribution of different flow path on the heat transfer and flow performance of multiple micro-channel parallel flow condenser were investigated. The results show that, as the flat tube inner hole numbers increase, the heat transfer rate and air-side pressure drop increase, while the refrigerant-side pressure drop decreases;  when the proportion of the height and width of the inner hole increases, the heat transfer rate and refrigerant-side pressure drop decrease, and the air-side pressure drop remains constant; as the flow paths number increases, the heat transfer rate and refrigerant-side pressure drop increase; when the flow paths number remains constant, the principle of flat tubes distribution is that the tube number in every flow path should be decreased in turn, the decreasing speed should be gradually slowed down, and the tube numbers in the subcooling section should not be too few.