Abstract: The fracture width, which is an important parameter of hydraulic artificial fractures in oil fields, can be quantified by the tracer-sand ¹⁹²Ir. First, through the deduction and calculation based on the simulated fracture model, the linear relationship between the fracture width and the ¹⁹²Ir ray intensity can be obtained. The tracer-sand ¹⁹²Ir for tracer experiment is prepared, and then add the tracer-sand into the simulated fracture filled with the supporting sand, and log in the laboratory fracture width apparatus, the experimental relationship curve between fracture width and ¹⁹²Ir ray intensity is obtained. Finally, field experiments prove that the use of tracer-sand to evaluate the width of hydraulic fracturing is accurate.