Taken woman sun-top as an example, the design and technology of jacquard seamless underwear based on GE296D-EL/J warp knitting machine developed by Wuyang Textile Machinery Limited Company was introduced in this paper, which included the design and import of jacquard stitches,the parts of the seamless underwear, the design and connection among three basic stitches, namely thin, mesh and thick part, the technology of seam, partition and cutting areas, and so on.