The remote Laser-induced Breakdown Spectroscopy (LIBS) technology can be applied to analysis of aviation alloy raw materials in-situ. It provides a new method for online monitoring of aviation industry production. In this work, a coaxial remote LIBS device based on fiber optic spectrometer is developed, and its focus distance can be adjusted from 1 to 30 m continuously. Using the remote LIBS, 6 raw aviation alloy samples with different brands were measured at the distance of 4 m. Then 6 characteristic spectral lines were selected for spectral analysis with K-Nearest Neighbor (KNN) algorithm. The experimental results show that the accuracy of discriminationrate can be up to 98% when the 10 laser pulses deposited on the same ablation point. The accuracy of discrimination rate can be improved to 100% when more than 20 laser pulses deposited on same ablation point. This work can help to discriminate raw materials rapidly and accurately in industrial production site with a remote distance.