In this research, the candidates of the Guidance and Psychological Counseling profession were asked about the role of mathematical thinking in the counseling process. Fifty candidates for Guidance and Psychological Counseling profession were participated in the research. Participants were asked to associate them with mathematical reasoning and psychological counseling process. Participants relate mathematical reasoning and services of guidance and psychological counseling to many subjects. At the end of the research, the following findings were reached such as (1) understanding the problem of the client, to realize the need more quickly, to create a goal, (2) the problem solving process in mathematics is similar to the process of solving the problem of the counselee (3) when approaching the problems of the client, it is useful in thinking fast and practical, (4) mathematical reasoning contributes to the counselor in finding a realistic and rational solution to the client's problems, (5) Mathematical reasoning makes it clear that problems can have different solutions. Thus, it directs the individual to behave as solution seeking, (6) the assumption, generalization and evidence gathering in mathematics is also present in consultation process, (7) mathematical reasoning gives the consultant multidimensional thinking and analysis of client problem.