Abstract: In order to explore a new method of computer simulation on plain weft knitted fabric and to show its real three-dimensional structure, based on Pierce′s 2-D weft knitted loop model and the feature of knit geometry configuration in space,a 3-D geometry loop model is constructed.Comprising several spatial arcs and curves represented by parameter equations,the model is implemented under the(VC++) programming circumstance by OpenGL drawing program and the spheroid technique in its library functions.The result of research and computer simulation indicate that the modeling and implementing method can give vivid effect of plain knitted fabric with 3-D intermeshed loops without the need of concealment processing.