The nanostructural alumina fibers successfully prepared starting with lactic acid and aluminium nitrate by sol-gel techniques, can be less than 1 μm in diameter and consists of nanometer particles. After studying the factors infecting the spinnability of gel precursors and the whole process of thermal decomposition, a primary technical conditions for preparing nanostructural alumina fibers has been obtained. Also the morphologies,composition of physical phase and structure of gel precursors fibers and nanos...