Abstract: Lyotropic liquid crystals formed in 3octoxy2hydroxypropyl trimethyl bromide (a new surfactant)/nbuatnol/ water system were studied at 25℃. Some typical photographs clearly showing texture structure of liquid crystal were obtained by using microscope with polarizedlight. The specific region of liquid crystal were determined in the diagrams. The experimental results show that with the addition of water the phase structure will vary from the single lamella liquid crystals through mixed lamella and hexagon...