The aim of this study is to identify the influence of morphological analysis strategy employed by Palestinian 10th grade-female students in guessing and manipulating complex words in addition to using these words in meaningful sentences. This study involved 75 female students from Idna Secondary School for Girls at Hebron governorate. The sample of the study was assigned to control group (37 students) and experimental group (38 students) from two different sections. To achieve the aims of the study, morphological structure test based on students’ textbook has been given to both groups in form of pretest/posttest. Meanwhile, the experimental group has received treatments on morphological analysis strategy prior to the post-test, whereas the control group hasn’t received any treatment except for the traditional way of teaching for the same two units. Results showed that the experimental group has outperformed the control group as they scored higher grades. They also scored better results in identifying the syntactic category of English words depending used in context.