For improving atomizing nuzzle performance of atomizing system, the measurement method of the particle size of phase Doppler interferometer flight probe double range in icing wind tunnel is introduced. The principle and application conditions of PDI-FPDR system were introduced. The test results of icing wind tunnel spray system under different water pressure and pressure conditions were given. Preliminary analysis and comparison about test result. Test result shows that the test method is effective and reliable, which provides a basis for the study of cloud characteristics of icing wind tunnel.