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Mental workload (MW)-based adaptive system has been found to be an effective approach to enhance the performance of human-machine interaction and to avoid human error caused by overload.However, MW recognized from the spontaneously generated electroencephalogram (EEG) was found to be task-specific.In existing studies, EEG-based MW classifier can work well under the task used to train the classifier (within-task) but crash completely when used to classify MW of a task that is similar to but not included in the training data (cross-task).The possible causes have been considered to be the task-specific EEG pattems, the mismatched workload across tasks and the temporal effects.In this study, cross-task performance-based feature selection and regression model were tried to cope with these challenges, in order to make EEG-based MW estimator trained on working memory tasks work well under a complex simulated multi-attribute task (MAT).The results show that the performance of regression model trained on working memory task and tested on multi-attribute task with the feature subset picked-out were significantly improved (COR: 0.740±0.147 and 0.598±0.161 for feature selection data and validation data respectively) when compared to the performance in the same condition with all features (chance level).It can be inferred that there do exist some MW-related EEG features can be picked out and there are something in common between MW of a relatively simple task and a complex task.This study provides a promising approach to measure MW across tasks.