Research in the field of second language acquisition (SLA) has been done to ascertain the effectiveness of visual input enhancement (VIE) on grammar learning. However, one issue remains unexplored: the effects of VIE density on grammar learning. This paper presents a research proposal to investigate the effects of the density of VIE on English grammar learning. An introduction to the issues to be discussed is first presented. Next, a brief review of the current literature related to the topic to be investigated is mentioned. Other essential components of a research proposal which include the research questions, the subjects of the study, the procedures, and the methods used to analyze the data are respectively delineated. Finally, the potential contributions of the present study are indicated. First, the English grammatical structure to be visually enhanced and examined empirically in this study has probably not been looked at in previous research. Second, the questionnaire used to elicit learners' perceptions and reactions about the use of VIE in reading texts also appears to be a new perspective on researching VIE and grammar learning.