Abstract: In order to study the stability of drawing fluid, referencing with traditional methods, multiple light scattering instrument Turbiscan was applied to study the stability of two brands of drawing fluid systems which have same concentration and same preparation process at 25 ℃and 50 ℃. The absolute value of transmitted light and backscattered light and the change of light intensity (△T value of transmitted light and △BS value of backscattered light) after multiple scans were obtained. The stability index and the dispersion uniformity index were then automatically calculated by the software. According to the method, the stability of the two kinds of drawing fluid is judged, and the result is consistent with the data of the effect and the usage cycle in actual use. Therefore, the use of multiple light scattering instrument can quickly and accurately evaluate the stability of drawing fluid, and help to select raw materials and adjust the use process.