The instrument can be used to simulate formation pressure and formation temperature under the following conditions: 1. The measurement of liquid permeability is to make the liquid pass through the core at a certain velocity. By measuring the pressure difference between the inlet and outlet of the core and the flow rate of the liquid through the core, combined with other parameters, the core liquid permeability is calculated according to Darcy's Law. 2. Formation sensitivity (formation damage) evaluation Studies formation damage caused by foreign substances during drilling, completion, waterflooding, stimulation, and workover operations, and ways to avoid or mitigate such damage. 3. Oil production technology research, acidification, fracturing, water plugging, adjustment of injection and production profile and other tests. 4. Enhanced oil recovery research, secondary and tertiary recovery