The present study aimed to investigate the effectiveness of using WebQuest strategy in improving grammar competence for second year preparatory school students. Participants of the study were 33 (both males and females) of 2nd year students at Elwaadla preparatory school, Sedfa directorate, Assiut governorate. The instruments of the study included Grammar and Pre-Post-test and WebQuest lessons. The results indicated that the WebQuest strategy had a significant positive effect on students’ scores on the grammar test. Results also indicated that the students’ means of scores on the post-test of grammar was higher than the means of the scores on the pre-test. It is recommended to teach students through WebQuest strategy to improve other language skills such as listening, speaking and reading. My research study might be replicated with larger and more diverse samples.