The aim of this research is to find out the effect of history teaching on the development of some reasoning skills during the secondary stage in Iraq The researcher in the second semester of the history course for the first grade secondary in public schools under the Directorate of Education and Education in Babel - Iraq The research group consisted of (60) students randomly selected. The sample was divided into two groups, one experimental group and the other control group, as follows: The experimental group included students of the first grade secondary (A) with 30 students. The control group included students of the first grade secondary (B) and number (30) 2017. The research found that there is an impact of teaching history in the development of some reasoning skills during secondary school in Iraq