Abstract: This study investigated on metamemory of 90 subjects using short Form Metamemory Inventory and MIA.The subjects were divided into young,old and old-old groups.The results showed that:1.The numbers of memory prediction of paired-association words and figures decreased with age.The age differences in memory prediction were significant.There was no age difference in accuracy of evaluation.After training,the predicted performance improved significantly,while the accuracy of evaluation didn't increase.The post-estimation was similar to prediction.The accuracy of evaluation in them was higher than that in prediction.It suggested that metamemory might be improved through memory process.2.The degree of self-confidence and the numbers of applying strategy decreased with age.They might be important factors influencing memory.3.The performance of Additional Paired-Association Learning and Figural Free Recall were correlated to most of the items in self-estimation of Short Form Metamemory Inventory and MIA in different degrees.It indicated that metamemory was significantly correlated to memory.

Key words: metamemory, life-span development, monitoring, strategy