The purpose of this study was assessing impact of problem-solving styles on academic achievement of Agricultural Students in the University of Tehran. The statistical population of this research consisted all of the fourth-year agricultural undergraduate students in the University of Tehran (N=250). Applying proportional stratified random sampling method 103 students were selected for studying. The main instrument of study was a questionnaire validity of which was approved by a panel of experts and its reliability tested by Cronbach's Alpha coefficient (α>0.70). Data were analysis (Descriptive statistics: frequency, percentage, mean, standard deviation, Minimum and Maximum) and (inferential statistics: correlation analysis and regression analysis) was conducted by SPSS for Windows. The results showed a significant positive relationship between academic achievement and creative and confidence problem-solving style. Results of stepwise multiple regression analysis revealed that among problem solving styles only creative problem-solving style had a significant effect on academic achievement of students. The findings can be used by managers, planners and educators to improve the academic achievement of students in higher agricultural education system.