The purpose of the present study is to investigate the effectiveness of using Eclectic Approach based on flipped learning in developing freshmen students' grammar and writing performance . The design of the study was a mixed research methodology. It combined both quantitative and qualitative methods of inquiry. The participants of the study were fifty (N= 50) students enrolled in the first -year primary English section, at the Faculty of Education, Benha University, Egypt. They were tested before and after the treatment. They were taught through using Eclectic Approach based on flipped learning. The instruments of the study included an EFL grammar performance test , an EFL writing performance test , an EFL writing performance rubric and semi-structured interview. The results of the study revealed a statistically significant difference between the mean scores of the study participants in the pre and post administrations of the EFL grammar and writing performance tests in favor of the post administrations. These results were ascribed to Eclectic Approach based on flipped learning .