This study was conducted to investigate the influences of a horticultural activity program applying REBT group counseling on female marriage immigrants’ self-expression and the degree of depression. The subjects that applied for the program are 14 persons. With them, 10 sessions in total were carried out for two hours per time on every Wednesday at the J. gun (County) Social Welfare Center from December 17, 2013 through February 25, 2014. To look into a result of a pre-test on homogeneity between the control group and the experimental group. For self-expression as a result of a t-test in the control group, there was no significant difference in the average (p=.825), t=0.42 (p>.05). For depression, in the control group, as a result of a t-test, there was no significant difference in the average (p=.142), t=-1.145 (p>.05). To look into the change of self-expression according to the process the program. As a result of a T-test in the control group, there was a very significant decrease, t=-7.675 (p<.001), it turned out that self-expression decreased during the program . As a result of a T-test in the experimental group there was a very significant increase, t=9.899 (p<.001), it turned out that self-expression increased during the program. To look into the change of self-expression according to the process the program. To look into the change of depression. As a result of Wilcoxon signed-rank test in the control, there was a significant increase (p=.016), z=-2.410 (p<.05), it turned out that their depression increased during the progress of the program. As a result of a T-test in the experimental group there was a very significant decrease, t=-7.175 (p<.001), it turned out that their depression decreased during the process of the program. As a result of a Pearson Correlation analysis on the factors of self-expression and factors of depression, their score of self-expression after the program had a significantly negative (-) correlation with their depression score (r=-0.705) after the program. Like the above results of the study, the horticultural activity applying REBT group counseling is effective for improving female marriage immigrants’ self-expression and reducing their depression.