This standard specifies a method for measuring the fluidity of plastics using a capillary tubing Rheometer and a slot-die Rheometer. The flowability of plastics is a key parameter characterizing their processing performance and rheological behavior, and is of great significance for the optimization of molding processes such as injection molding and extrusion. The standard describes in detail the requirements of test equipment, sample preparation, setting of test conditions, operation procedures and data analysis methods, covering the acquisition of melt flow Linear dispersion and the calculation of rheological parameters.