Disperse dyes are the most important dyestuff for dyeing of polyester fiber which can be applied by the carrier, high pressure and thermofix methods. In this research, the polyester fabrics are irradiated by microwave radiation and then dyed in open vessels. Besides, the results of dyeing of fabrics by microwave were compared with usual dyeing methods. Although the pretreatment of polyester fabrics do not affect the dyeing yield, but dyeing by microwave leads to better dye absorption and increases the dyeing rate in comparison with usual dyeing method.