Abstract: Boehmite γ-AlOOH nanorods were prepared through liguid phase method at 200 ℃ in the solution with pH value of 5,using aluminum chloride and sodium hydroxide as raw materials.The products calcinated at different temperatures and the thermal decomposition of the products during heating were analyzed.The results show that γ-AlOOH nanorods with diameter of 10-30 nm and length of 100-300 nm could be obtained under the test condition.The nanorods transformed to γ-Al2O3 when they were calcinated at 500-1 200 ℃.The α-Al2O3 and θ-Al2O3 were generated at 1 250 ℃.The α-Al2O3 was generated at 1 300 ℃ and the nanorods formed aggregates after calcinating.The course of thermal decomposition of γ-AlOOH nanorods was divided into four stages,including desorption of physisorbed water,desorption of chemisorbed water,conversion into transition alumina and dehydration of transition alumina.