This study aimed to reveal the effect of using augmented reality in teaching mathematics on visual thinking development and the achievement of basic grade 2 students in the Sultanate of Oman. In order to fulfill the goals of the study and answer the questions about it, the researcher uses a semi-empirical curriculum which is the Study sample contained (58) students from basic grade 2 in Muscat governorate. IT has been selected deliberately to follow the procedures of the Study. Which it is divided into 2 groups, one of them is experimental for (29) students and the other is control for (29) students. These two groups were verified equal. Then prepared a list with visual thinking skills, which is included 6 skills (recognize the shape and describe it, visual imagination, visual translation, visual differentiation, visual analysis, visual organization). Subsequently, set up Study tools and it included (visual thinking exam, achievement educational exam in the engineering unit for basic grade 2). Then it adjusted statistically and applied before for the Study group. Then teaching educational content using an application based on augmented reality technology, -which was done by the researcher - according to the teacher's guide especially prepared for that. After the completion of teaching the unit, therefore they applied Study tools, monitored data and statistical processing. The study found the following: revealed statistically significant differences at the level of significant (α≤0.05) between the middle of experimental and control sample degree in applied for visual thinking exam, achievement educational exam in engineering unit for an experimental sample which it taught by applied augmented reality. The effect of teaching by augmented reality is large to visual thinking skills, and its effect on achievement education was average. The study also found a strong positive related relationship between the achievement degree exam and visual thinking degrees at a significant level (α=0.01). Based on the results, the Study provided a group of recommendations, mainly mainstream of using augmented reality technology in all educational curriculums, necessary urge, prepared, and train teachers for using the applications based on augmented reality technology.