This research aims to explore a pedagogical strategy for the optimal use of free e-resources for supporting Chinese learners in Hong Kong to learn primary English grammar. Through a combination of qualitative and quantitative methods, this research will progressively design, evaluate and then establish an effective pedagogical strategy that optimizes the use of free e-resources for learning primary English grammar. A twofold documentary analysis will be conducted for the design of a potential pedagogical strategy. To evaluate the effectiveness of the designed pedagogical strategy in the real classroom environment, two classes of local Primary 4 students will be subsequently invited to a one-month trial teaching. Students in the experimental group will learn primary English grammar under the designed pedagogical strategy; whereas their counterparts in the control group will receive no treatment during the trial teaching period. These two groups of students will sit for a pair of identical pre-test and post-test before and after the trial teaching, respectively, to investigate the impact of the designed pedagogical strategy on the learning achievement of students. Students in the experimental group will be asked to complete a questionnaire survey after the trial teaching to indicate their perceptions of the designed pedagogical strategy. One-fifth of the students in the experimental group will be further invited to attend individual interviews to share more in-depth opinions on the designed pedagogical strategy. This research will finally advise a model of the pedagogical use of free e-resources that optimizes the learning of primary English grammar among Chinese learners in Hong Kong. Copyright © 2010 The authors.