Vocabulary learning and reading comprehensionSummary: Reading comprehension involves many interactive factors, which may be mental or physical. Among them linguistic skill and vocabulary as information media are the most direct and important factors. As indicated by the result of reading comprehension, precision rate of test and vocabulary learnt by test takers are directly proportional. Precision rate of reading comprehension will rise with the increasing amount of vocabularies mastered in learning process. Reading large sample related material could reach high precision rate when vocabularies in small sample have more overlaps with those in large sample. The amount of vocabulary and precision rate of reading comprehension are closely related.