In this study, the dimensional properties of half cardigan knitted fabrics were investigated in relaxation. Acrylics, cotton/ramie, and cotton were used for specimen knitting. SCSL(structural cell stitch length), course density, rib density, stitch density, thickness of sample fabrics were measured in dry-, wet-, oven-, relaxed states. And CF, MFT, demensional constants K1 were caculated. The difference of thickness in half cardigan knitted from cotton was strikingly larger than that of half cardigan fabrics knitted from acrylic, cotton/ramie yarns. In fully relaxed states, area shrinkage ratio of fabrics knitted from cotton/ramie, cotton were about 15%, 22% respectively. Values of K1-4 under fully-relaxed state were as follows.