Abstruct Nowadays Bi-Shrinkage yarns (BSY) are used increasingly in textile industries. BSY is a kind of two components yarns which its components have different shrinkage. BSYs are often twisted in high levels and it is necessary to be heat set. Vacuum heat set is a common way for setting these yarns. In vacuum set it is common to use two different methods, called “one stage set” and “two stages set”. In this work the different effects of these two methods on yarn and woven fabric were examined. Selected yarns (130D/72f and 135D/108f) were twisted in three levels (1600, 1800 and 2000 TPM) and set in both methods of heat set. Set yarns were used as weft yarn in fabric and all other weaving parameters were the same. The experiments were carried out in two categories; yarn experiments (tenacity of yarn and shrinkage in boiling water) and fabric experiments (fabric drape, fabric bending in weft direction, qualification fabric surface friction coefficient, CIE LAB, SEM and weft protrusion). The results were examined by ANOVA and the Tukey comparison test. The results showed that the type of heat set stage had significant stasistical differences on some fabfic features including surface friction coefficient and weft protrusion. The “two stages set” showed more significant effect in comparison to the one stage set. The twist levels and the number of fibers in yarn affect some fabric and yarn features including fabric drape and tenacity of yarn as well. Finally it should be said according to the end use of this special fabric which is called wool peach, which is a kind of women garments in Islamic countries, the two stages vacuum heat set is more suitable for setting the twist of high twisted BSYs. Key words : BSY, one step set, two step set, friction coefficient, linear density, drape.