Abstract: The lignite is one of the major energy in our country, witn the increasing depletion of resources,enhance the use of low rank coal is of great significance.The flotation is one of the major methods to process the fine particle coal, but the lignite flotation are still stay at laboratory. The reason of lignite hard flotation and the research results of lignite flotation were described. Studies are taken on the lignite floation reagent system are also depicted.The surface charge of lignite change with the pH chang and diffrernt surfactants adsorbed on lignite. Change the characters of lignite can be taken some measures to make new particles. On these facts,some suggestions and outlooks about the lignite flotation were also proposed.