The study aimed at finding out the impact of the use of the (K.W.L) strategy in the achievement of the ninth grade students in Islamic Education. The researcher followed the semi-empirical approach on the sample of 66 students from the ninth grade students in Muscat Governorate in Oman, The study consisted of two groups: Aisha Bint Abdullah Al Rasabiya (5-9), 32 students, and a group of students from Asilah Bent Qais Al Busaidiya School (5-9). In order to achieve the objectives of the study, the researcher formulated the fifth unit of the book of Islamic Education for the ninth grade, according to the strategy of (K.W.L), and prepared a test of collectivity, consisting of (20) of the type of choice of multiple, has been verified its validity and stability. In order to achieve the objectives of the study, the researcher formulated the fifth unit of the book of Islamic Education for the ninth grade, according to the strategy of (K.W.L), and prepared a test of collectivity, consisting of (20) of the type of choice of multiple, has been verified its validity and stability. The test was applied to the students of the experimental and control groups to ascertain the equivalence of the two groups in the test. The researcher used the T-test to measure the differences between the mean scores of the experimental and control groups. The result was that there were no statistically significant differences between the two groups After the study was completed, the experimental test was returned to the experimental and control groups. The results resulted in: 1. There were statistically significant differences at the level of significance (0.05) between the average scores of the experimental group and the control group in the post-application and for the benefit of the experimental group. 2. There were statistically significant differences at the level of significance (0.05) between the tribal and post-application of the mean scores of the experimental group students in the achievement test, and for the post-secondary application. In light of the results of the study, the researcher recommended that all teachers and teachers of Islamic education be interested in using the (K.W.L) strategy in the teaching of Islamic education because it has a positi educational achievement of students and the need to develop Islamic education curricula and to prepare them to be consistent with the methods and strategies of modern teaching derived of the psychological theories that focus on the role of the learner and make it the focus of educational learning, including the strategy of (K.W.L).