Abstract: Algae are considered to be the most promising biomass due to their high photosynthetic efficiency，short growth period，large biomass. The research activities and trends in direct liquefaction technology of Chlorella，Spirulina and Dunaliella salina，which had been industrialized，and some other kinds of microalgae were presented in detail. The traditional direct liquefaction process with water and organic solvent as medium were reviewed，and further study focus on new direct liquefaction process，such as normal pressure catalytic liquefaction and co-liquefaction，were provided. Besides，direct liquefaction of some macroalgae was also remarked，and it showed that enhancing research on direct liquefaction of macroalgae is needed.

Key words: microalgae, macroalgae, direct liquefaction, liquid fuels

摘要： 藻类因其光合作用效率高、生长周期短、生物量大等优点被认为是最有应用前景的生物质。本文详细介绍了3种已实现工业化生产的小球藻、螺旋藻和杜氏盐藻以及其它几种微藻直接液化的研究现状和发展趋势。阐述了以水和有机溶剂为介质的传统直接液化工艺的优缺点，指出常压催化液化和共液化等新型直接液化工艺将是未来研究的重点。此外，对几种大型藻的直接液化作了简单评述，指出需加强对大型藻直接液化的研究。

关键词: 微藻, 大型藻, 直接液化, 液体燃料