The geological reserves of Class III reservoirs in Daqing Oilfield are abundant, making them important targets for chemical flooding development in the future. However, due to the characteristics of multiple layers, thin thickness, and low permeability of its reservoirs, it is necessary to monitor the injection capacity of injection wells in real time to ensure the effectiveness of chemical flooding development. In order to evaluate the chemical flood injection situation and further improve the development effect of the block, the characterization of Hall derivative curve and the rapid solution method were studied by reservoir engineering method, and the reasonable technical limit of apparent resistance coefficient and the optimization and adjustment countermeasures were given and applied to the field. The results show that Hall derivative curve is more sensitive and real-time than Hall curve in monitoring the injection capacity, and the automatic analysis can be realized quickly by using the quick solution tool. The Hall and its derivative curves of different types of well groups are different. Only when the apparent resistance coefficient is in a reasonable range can better EOR effect be obtained by chemical flooding. The effect of chemical flooding using Hall derivative curve and reasonable apparent resistance coefficient technology limit in LBD test area is remarkable, and the recovery rate is increased by 13.5%. The research results are of great significance for guiding the large-scale application of chemical flooding of Class III reservoirs in Daqing oilfield.