Grafting as a common industrial tool is used for propagation of cactus plants. Gymno calycium doesnot have chlorophyll pigments and they should be grafted to root stock containing chlkorophyll. Preparation of scion of these ornamental plants is difficult. In this research, the effect of applied exogenous AUXIN treatment on micrograting of cactus plants was assessed. Gymno calycium and Tryco sereus were used as a scion and root stock, respectively. IBA is used as a AUXIN. Plants were treated with Four different concentrations of IBA (0, 50, 100 and 150ppm) and at three levels of time (3, 9 and 15 days after micrografting). 30 day grafted plants were compared. The best results were observed in 100 ppm especially in 100ppm-15days. The obtained results from present study indicated that IBA at the optimal concentration (100ppm) is more effective treatment and result in increased successfull grafts.