A method for measuring and evaluating the quality of X-ray angiography is used to solve the problem of time-consuming and low accuracy of conventional image evaluation methods. The system includes: an imaging step, an x-ray machine irradiates a prosthesis to generate a measurement image, the prosthesis has several layers, the radius square of each layer of the prosthesis is reduced from the outside to the inside by an equal difference series, The thickness of each layer of the prosthesis is increased from the outside to the inside in equal series； a positioning step detects a center point of the measurement image； a sampling step uses the center point as a reference to segment the measurement image into numbers An equal-area sampling area； and an operation step that uses the thickness of each layer of the prosthesis as an input variable and an image signal of each of the sampling areas as an output variable to calculate the input variable and the output variable A mutual message value.
