Corn fiber is a concept proposed in 1948,which involves in the polymeric fiber that made from corn as the raw material, and it was turned to lactic acid, transformed into lactide, and polymerized to polylactide or polylactic acid. Since that, some progresses have been made. However, the feature of corn fiber is determined by the molecular weight of polylactide. In general, corn fiber is formed by means of the melt-textile or no-hydrous textile. The situations, technologies, properties of the corn fibers are reviewed, as well as the processing about lactide synthesis, lactide condensation polymerization. It has some professional properties, such as high transparency, well-heat-resistant stability, well-colors, and full biodegradability, as well as the feature in ecological recycle. These means the corn fibers are new-typical and green, full-environmental fibers, especially for China as the second great number of the products of corn. Research and development of corn fibers are launched off in the world. Some problems existes in the corn fiber manufactured field are to be evolved, which are small scale, high cast, little of end-products enrolled in the market. So is down the cast of corn fiber manufactured as the very important works. This means that systemic studies of the fiberous polymerization and processing are crucial and highlighted to in this field.