In order to determine the second-order nonlinear optical property of the ultraviolet powder material, according to the Kurtz-Perry powder second-order nonlinear optical theory, a study on the second-order nonlinear optical performance test of the ultraviolet powder was carried out. The test laser is a Nd∶YAG-KTP electro-optical Q-switched laser pumped by xe-lamp. KTP is the nonlinear optical crystal, with an output wavelength of 532 nm, a single pulse energy of 100 mJ, a repetition frequency of 1-10 Hz, and a pulse width of 8 ns. In order to ensure the transmittance of 266 nm, ultraviolet melting quartz JGS1 was used as the window. In order to ensure the accuracy of the test, the grating spectrometer was selected to split the light. According to tests of KDP, LBO, BBO, which commonly used in UV prove that this method has the advantages of stability, reliability, high discrimination accuracy, and simple operation. As an important testing method, it can effectively qualitatively or semi-quantitatively test the UV second-order nonlinear optical properties of materials.