A 3-year longitudinal study among 239 Chinese students in Grades 2-4 was conducted to investigate the relationships between orthographic skills (including positional and functional knowledge of semantic radicals and phonetic radicals, and orthographic memory of radicals) and Chinese literacy skills (word reading, word spelling, reading comprehension and written composition). Phonetic radical knowledge was the only significant longitudinal predictor of word reading, whereas all orthographic skills examined were significant longitudinal predictors of word spelling. Reading comprehension was uniquely predicted by semantic radical knowledge. A model showing the relationships between orthographic skills and literacy skills was postulated.