The present study attempted to address the paucity of developmental data on English reading and spelling development among Chinese English-as-a-second-language (ESL) learners. English reading and spelling development among Chinese ESL learners in Hong Kong was examined in a one-year longitudinal study covering three developmental periods: Kindergarten to Grade 1, Grade 2 to Grade 3, and Grade 4 to Grade 5. One hundred and fifty five participants were tested on three types of cognitive-linguistic measures (rapid naming, phonological processing, and visual-orthographic processing) and language proficiency measures (English reading, English spelling and Chinese reading). Three major patterns of results were identified. First, the relationships between cognitive-linguistic skills and English proficiency measures differed among Chinese ESL learners of different proficiency levels. Previous research examining the significance of visual-orthographic and phonological skills to English reading and spelling development among Hong Kong Chinese ESL learners has yielded inconsistent results. On one hand, findings in some studies among kindergarteners and Grade 1 students demonstrated the predominant role of phonological skills to English reading and spelling development (Chow, McBride-Chang, & Burgess, 2005; McBride-Chang & Ho, 2005; McBride-Chang & Kail, 2002). On the other hand, the study by Leong, Tan, Cheng and Hau (2005) among Grade 4 – 6 students showed that visual-orthographic skills were of greater significance than phonological skills in predicting English proficiency. Since the participants in these studies were from different age groups, differences in results may simply reflect differences in age or ‘stages’ of reading and spelling development among the participants. Findings in the present study did confirm this speculation: phonological skills were of particular importance to English reading and spelling development among younger participants while the significance