Abstract: <SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">Methods including alkali sintering method,acid leaching method and so on of extracting alumina from fly ash and research progress thereof at home and abroad have been expounded.According to the structure and composition of fly ash,advantages and disadvantages of various methods of preparation of alumina with fly ash were discussed respectively through the analysis on experiments and researches done by other scholars.So the point of research and the main development direction of extracting alumina from fly ash were concluded.With energy-saving and emission-reduction as the guiding policy,alkali sintering method and acid leaching method were being perfected,and simultaneously,researches both on the activation process of the former method and on the extraction of multiple oxides of the latter one were strengthened.In addition,the dependence of acid leaching method on the equipment was being reduced.In this way,sustainable development was achieved. Besides,further research and development on new technology,such as microwave assisted solubilization to extract alumina from fly ash should be also carried out.</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN>