The maximum theoretical tester for asphalt mixture is a professional instrument used in the field of road engineering material testing to determine the maximum theoretical density of asphalt mixture. In the stage of asphalt mixture proportioning design, the maximum theoretical density data obtained through this instrument can help engineers determine the optimal asphalt content and aggregate gradation. In road condition investigations, it can be used to evaluate the difference between the actual state and the designed state of pavement materials. For pavement construction quality management, the maximum theoretical density is an important basis for calculating key indicators such as compactness. The calculation formula for compactness (compactness = field measured density / maximum theoretical density) involves this parameter of maximum theoretical density.