This research reports on the calculating technique which is to progress and to arrangement a four-tier diagnostic test implement, which has not been well-defined in the mechanism. It is an enriched technique of the two-tier test components. As in two-tier tests, its answer and reason tiers degree pre-service elementary  teachers’ contented understanding and expressive understanding, separately. The two more tiers quantity the different of confidence of pre-service elementary teachers’ in the rightness of their confident choices for the answer and reason tiers separately. The four-tier diagnostic test was concentrating on heat transfer concept. It was restrained to 43 pre-service primary school teachers’ advanced. They were acceptably trained on the earlier subjects. The important group of the defendants was recognised to have an unsuccessful sympathetic and misconceptions of the themes tested. We have already defined that the test able to investigate and categorize students into student conception of heat transfer concepts. Research result with four tier tests showed scientific conception 12%, which was likely to have misconceptions 60%, and the students were lack of knowledge the concept of 23%, and had an error amounted to 5%. The pre-service primary school teachers’ inclined to be indisposed aware among what they diagnosed and what they do not diagnose. Kind of question tested was connected by enhanced percentage of pre-service primary school teachers’ substantial accurate responses, established buoyancy and enhanced perception calculation. 5 truthful misconceptions were predictable. It might be determined that a Four-Tier Diagnostic Test which has previously been established be able to assess pre-service primary school teachers’ conception on heat transfer concept.