NOVELTY - A hydrogen producing composition comprises water hydrolyzing aluminum, aluminum iodide, aluminum bromide, aluminum chloride hexahydrate, aluminum chloride, sodium hydroxide, auxiliary agent, and water prepared from water hydrolyzing aluminum and chemical engineering materials. The composition may include: water hydrolyzing aluminum, aluminum iodide and water; water hydrolyzing aluminum, aluminum chloride and water; water hydrolyzing aluminum, aluminum bromide; water hydrolyzing aluminum, sodium hydroxide and water; or water hydrolyzing aluminum, potassium hydroxide and water.    USE - A composition for producing hydrogen for replacing gasoline and diesel useful in hydrogen/gasoline internal-combustion engine and hydrogen fuel cell used in boats, warships and submarines.    ADVANTAGE - The boats, warships and submarines that use hydrogen, which is produced by the composition, do not discharge smoke, produce little noise, and travel at high speed since the composition includes large amount of water. Further, the submarines which use the produced hydrogen has better invisibility and safety.    DETAILED DESCRIPTION - A hydrogen producing composition comprises water hydrolyzing aluminum, aluminum iodide, aluminum bromide, aluminum chloride hexahydrate, aluminum chloride, sodium hydroxide, auxiliary agent, and water prepared from water hydrolyzing aluminum and chemical engineering materials. The composition may include:    (1) water hydrolyzing aluminum (1-100 g), aluminum iodide (1-30 g) and water (100-300 g);    (2) water hydrolyzing aluminum (100 g), aluminum chloride (1-20 g) and water (100-300 g);    (3) water hydrolyzing aluminum (100 g), aluminum iodide (1-20 g) and water (100-300 g);    (4) water hydrolyzing aluminum (100 g), aluminum bromide (1-25 g) and water (100-300 g);    (5) water hydrolyzing aluminum (100 g), aluminum iodide (1-10 g), aluminum bromide (1-16 g) and water (100-300 g);    (6) water hydrolyzing aluminum (100 g), aluminum iodide (1-10 g), aluminum chloride (1-16) and water (100-300 g);    (7) water hydrolyzing aluminum (100 g), aluminum bromide (1-16 g), aluminum chloride (1-16 g), and water (100-300 g);    (8) water hydrolyzing aluminum (100 g), sodium hydroxide (50-200 g) and water (100-300 g); or    (9) water hydrolyzing aluminum (100 g), potassium hydroxide (30-50 g) and water (100-300 g).