Abstract: Toutunhe formation is the new-discovered stratum bearing sandstone-type uranium ore in Yili Basin in recent years.The lithology-lithophase characteristics that are the important ore-controlling factors of Tountunhe formation of Honghaigou uranium deposit in southern margin of Yili Basin is analyzed systemically so as to discover its special metallogenic regularity and to provide important theoretical evidence for the following uranium exploration work in Yili Basin.According to the characteristics of lithology，development of sandbody，and the ratio of sand to stratum，and combing with the evolution of regional sedimentary sysyem，it is concluded that，Toutunhe formation is a main channel along west to east.Both sides of the channel is the flood land，and outside of the flood land is the floodplain.In the local area of the main channel，the sandbody becomes thinner，and the sandbody is the mudflat deposition in the middle of channel.The sedimentary environment in the sedimentary period，the development of mudflat in the middle of channel and the phase change of sedimentary micro-phase are the important ore-controlling factors for uranium mineralization.The ore-bearing fluid that is perpendicular to the direction of the channel seeps and forms the industrial uranium orebody eventually，which is the special metallogenic model compared with other ore-bearing stratum in Yili Basin.

Key words: Honghaigou uranium deposit, Sandstone-type uranium ore, Toutunhe formation, Lithophase characteristics, Ore-controlling factor