This research was carried out with the purpose of determining the effectiveness of the self-knowledge educational package based on the theory of existentialism on the illogical beliefs of communication on people. The statistical population included all married people who referred to counseling and psychological centers in Tehran's 1st and 3rd districts with marital problems. In the current research, experimental research method of quasi-experimental type of pre-test and post-test design with control group was used. In the research sample, 16 people who had a high level of irrational beliefs were selected voluntarily based on the answers to the voluntary questionnaire of counseling centers, and 8 people were randomly replaced in the experimental and control groups. The data collection tool was Adilson and Epstein's communication irrational beliefs questionnaire, which was conducted with a pre-test and post-test design with a control group and 12 data collection training sessions. Multivariate analysis of covariance or MANOVA method was used for data analysis. The results of the analysis of covariance in the Mankva text showed that in the main hypothesis, the analysis of covariance in the variable of couples' irrational beliefs (sig=0.02, F=6.059) is significant.
The results of the sub-hypotheses also showed that the analysis of covariance in the variable of destructiveness, belief in the changeability of the spouse, belief in mind reading, belief in sexual perfectionism and sexual differences of couples is significant.
the self-knowledge education based on the existentialism approach is effective on the irrational beliefs of married people.