Aligned single-crystalline β-Si3N4 whiskers with high aspect ratio were first prepared via a Self-propagating high temperature-synthesis (SHS) process, by using tungsten powders as catalysts. The as-synthesized Si3N4 whiskers typically have uniform diameters of 400 nm, length about 200 µm, and exhibit smooth and straight surfaces. Above all, the products possesses a perfect aligned structure, which is quite different from the reported β-Si3N4 whiskers. Elastic bending modulus of individual whiskers was measured by in-situ TEM process, the average value of elastic bending modulus of individual as-synthesized whiskers was 488 GPa. Results revealed that tungsten powders plays an significant effects on the morphology of Si3N4 whiskers.