Abstract: Based on the analysis of the Slot-Based Model and the Flexible Resource Model, three aspects of visual working memory capacity are still in argumentation: a) whether the resolution of the items in memory is variant or not; b)whether the resource allocation is conducted in a continuous fashion or in a quantized fashion; c)whether the unit of visual working memory is the object or the feature. In the end, this paper indicated the prospects in the research in future. The further research should include exploring the capacity unit, using new research method, and controlling the spatial factor.

Key words: visual working memory, working memory capacity, the Slot-Based Model, the Flexible Resource Model