To improve the combustion efficiency of aluminum powders， Al-LiH composite fuels with mass contents of 3%， 5%， 10%， and 15% were prepared using the ball milling method， respectively. The sample structure， morphology， and particle size are characterized by X-ray diffraction （XRD）， scanning electron microscopy （SEM）， and particle size analyzer. The thermal oxidation performance was characterized using the DSC-TG. Finally， their combustion performance was investigated using the CO₂ laser ignition device， high-speed camera， and oxygen bomb calorimeter. The results show that LiH can be embedded into Al powder through the ball milling method， and the LiH content is a key factor affecting its microstructure， particle size， and particle size distribution. The addition of LiH increases the mass calorific value of fuel. At the same time， with the increase of LiH content， the combustion flame intensity of Al-LiH composite fuel increases and the ignition delay time significantly decreases. Among them， Al-3LiH and Al-10LiH composite fuels achieve second oxidation after the first oxidation. The analysis suggests that the second oxidation phenomenon is caused by the microexplosion phenomenon of Al-LiH composite fuel at high temperatures.