Abstract: The development of 10-15 year old pupil's ability to prediot accur- ately in memory-monitoring was studied by adopting the procedure of "Learning-Judging-Recognizing" and by combining "Rating Scale" with "Re- cognizing Test". The experiment tried to explore whether or not 10-15 years old pupil's ability to predict accurately in memory-monitoring wo- uld develop with age and to analyse its function in their intellectual development. The results showed that: 1. 10-15 years old children's ability to predict accurately in memory- monitoring increased basically in pace with their growing age, but this development was not smooth. 2. Such experience as "The feeling of knowing" played a role of "guiding implements" and "activation implements" in informational coding, storing and recovering in memory. These findings not only provide a theoretical basis for developing pupils' intelligence, but also a scientific basis for daily teaching.

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