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Abstract: The crystal structure of Li3AlH6 was investigated at high pressures upto 27GPa using a diamond anvil cell with synchrotron radiation in addition to high temperature X-ray diffraction. Density functional theoretical (DFT) calculations were performed simultaneously. While the structure of Li3AlH6 is stable on increasing temperature, the results of high pressure experiments show a pressure induced phase transition from the ambient phase to a high pressure cubic phase around 10.6GPa. The transition pressure of 10.6GPa and the bulk modulus value B 0 =32(2)GPa for the phase obtained are in good agreement with the theoretical results. [Copyright &y& Elsevier]