Purpose: The covid-19 pandemic caused many and extensive changes and transformations in educational teaching. Considering the importance of students' academic achievement, the aim of this study was to comparison the effectiveness of Bybee's teaching method as face-to-face and non-face-to-face on the academic achievement of mail students of the first secondary school in the conditions of the Covid-19 pandemic. Methodology: This study was a semi-experimental with a pretest and posttest design with a control group. The research population was male students of the first secondary school in Zahedan city in the academic years 2019-2020. The sample size was 45 people (15 people for each group) who were selected by cluster sampling method and each of the clusters randomly by lottery replaced in three groups (two experimental groups and one control group). Each of the experimental groups was trained with Bybee's teaching method as face-to-face and non-face-to-face and during this time the control group was trained with the traditional method. The data were collected with Pham and Taylor's academic achievement questionnaire (1999), which whose validity was confirmed by the opinion of experts and its reliability was calculated by Cronbach's alpha method 0.92 and analyzed by methods of univariate analysis of covariance and Bonferroni post hoc test in SPSS software. Findings: The findings indicated that there was a significant difference between the experimental and control groups in terms of academic achievement. In the other words, Bybee's teaching method as a both face-to-face and non-face-to-face in compared to the control group caused a significant increase in the academic achievement of mail students of the first secondary school (P<0.001), but between the experimental groups means Bybee's teaching method as face-to-face and non-face-to-face there was no significant difference in increasing academic achievement (P>0.05). Conclusion: According to the results of this study mean effectiveness of both Bybee's teaching method as face-to-face and non-face-to-face on students' academic achievement and the lack of significant differences between them, to improve academic achievement can be used both Bybee's teaching method as face-to-face and non-face-to-face along with other effective teaching methods.
