This research tried to statistically verifying a predicting model of missionaries’ intention to seek counseling based on the theory of planned behavior (TPB). This research model was tested by structural equation model (SEM). The participants were 166 missionaries who have been missionary works abroad for more than a year. They were filled in a self–report questionnaire; attitude toward seeking counseling, subjective norms, behavioral control, stress, intention to seek counseling, and about their counseling experiences and perception. The result showed that the research model did not fit the data. After going through the process of modification model and testing it with SEM the modified model was selected as the final model. Modified model showed that attitude toward seeking counseling and stress significantly predict the intention to seek counseling, and subjective norms and control of behavior were fully mediated by attitudes toward seeking counseling.