This article presents the method and results of researching the loop length effect of high elastic knitted fabrics on their dimensional stability and pressure on surface simulating human body surface. The studied fabrics were a single weave, knitted from PA textured yarn
PA/PU core yam and PU yam with five variances of different loop lengths. The fabrics were tested by 5 cycles simulating thier use process. For each cycle, the fabric is stretched in course direction with elongation 50 percent (keep the same dimension in wale direction) for 24 hour. Then it is relaxed for 4 hours, washed, dried and stabilized for 4 hours. The results show that, loop length significantly affects on the dimensional stability and pressure of studied fabrics. The fabric pressure is inversely proportional to loop length. The fabric with small loop length is more elastic and more dimensional stability than that with large loop length.