This research has analysed the impact of morphological treatment in English morphological awareness task. The main aim of this study is to understand the relationship between morphological awareness and vocabulary knowledge of university preparatory class students. In second language learning environment, fifty-two preparatory class students have participated in this study. The participants have been divided into two groups as experimental and control group. Experimental group was conducted three hours of morphological guideline and morpheme teaching treatment during twelve weeks whereas control group was exposed to traditional vocabulary teaching. To explore the effects of morphological treatment on English vocabulary acknowledgement, all participants completed Nation's Vocabulary Size Test (2001), language history questionnaire and Morphological Awareness Test (Part A and B). The relationship between the pre-tests and post-tests results has shown that experimental group acquired higher score on vocabulary recognition than control group after thirty-six-hours treatment. These findings indicate that the participants who obtained morphological treatment took in consideration the morphemes and vocabulary items better than the others who took traditional vocabulary teaching procedure.