Studied the relationship between intelligence test performance and 3 visual inspection time measures including classical line inspection time, digital inspection time and component of Chinese character inspection time. 84 children, including 7 year olds, 9 year olds and 11 year olds, attended the test for 3 kinds of inspection time, all subjects also completed the Cattell's culture free test. Results indicated that inspection time in various tasks all showed trends of decreasing with increasing of ages. However, there were different speed of processing and change of development in the different tasks: the digital inspection time was longest in all tasks and the component of Chinese character inspection time was the shortest. From 7 year olds to 11 year olds, the line inspection time decreased slowly, while digital inspection time decreased quickly. No differences had been found between the sexes in different inspection time tasks. Experiments had showed that although inspection time of children is moderately correlated with intelligence test scores, the strength of the correlation between inspection time of children and intelligence test scores is attenuated relatively after controlling age factor. Correlation between inspection time of children and intelligence test scores is influenced by different inspection time tasks: digital inspection time task is sensitive to age variance, while line inspection time task is sensitive to within-group variance. Experiments also displayed correlation between faster inspection time groups, slower inspection time groups and intelligence test scores. Results showed that slower inspection time of children was significantly correlated with intelligence test scores, while faster inspection time of children and intelligence test scores were unrelated after controlling age factor.This finding suggested that worst performance (i.e., slower inspection time ) was a better predictor of IQ than best performance ( i.e. , faster inspection time).