Abstract: The calcium nitrate modifying effect of silk knitted fabrics which are treated by Ca(NO3)2solution at different experiment conditions(temperature or time or reagent concentration) is studied.By using orthogonal experiment,the performance parameters of fabrics appearance before and after the process of calcium nitrate modifying are compared,and better processes of salt shrinkage are determined.The results show that the calcium nitrate modifying effects of single-side fabric are superior to double-sided fabric remarkably;the ratio of salt shrinkage decreases with the enhancement of twist;3 preferable conditions of calcium nitrate modifying are:(46.8%,80℃,8 min),(46.8%,65℃,12 min),and(45.2%,80℃,5 min) under which the effects of calcium nitrate modifying are obvious with less damage to the fabric.