Abstract: The results of simulating experiments for the overlapping task in Lab. indicated that (1 ) The task overlapping type, the number of overlapping task and the intervallic time for the stimulus presentation are the factors which influence the performances of overlap memory which will be decrease with the increasing of the complex degree of the task overlapping type, which will be increase with the increasing of the inter- vallic time, which will be decrease with the increasing of the number of overlapping task in the multiple overlapping type, and then indicated that the time buzy and the intensity of thinking/ information-processing are factors of the mental workload. (2)The curve formula of overlap- ping memory in this experimental situation were made.

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