This paper was to clarify on therapeutic effectiveness of worship service from the viewpoint of Christian counseling. This researcher dealt with evangelical definition on worship, components of worship, and therapeutic effectiveness including hymnal, prayer, preaching, offering, and benediction. There were three functions: educational, associational, festival, and therapeutic function in worship service. If a Christian worships God in truth, one is able to experience healing physically, psychologically, and spiritually. The object of worship is the living God. Also, God is the healer. So God is going to give the power of healing to His people. It is very important faith phenomenon for a Christian to experience healing power from God. That healing phenomenon through worship service is not for some Christians but all Christians who worship to God in truth, in spirit. Accordingly, Christian counselors ought to give a counselee notice therapeutic functions of worship service. Worship service must be an opportunity to gain healing as a mean of grace. The researcher came to the conclusion that there is close relationship between worship service and therapeutic effectiveness.