ABSTRACT: This article investigates and analyzes the usability quality attributes of mobile government services. The lack of previous research in the area of mobile government service quality encourages the researchers of the current work to select the usability quality dimension, which is considered one of the most significant parts of the mobile government service quality framework. Using the systematic literature reviews in the area of usability in human-computer interaction and software design, the main attributes are extracted and analyzed to fit into the context of mobile government services. Five quality attributes of the usability dimensions are identified for evaluation of the quality of services of mobile government. These attributes are efficiency, satisfaction, memorability, error and compatibility. The present research proposes a model that can be used to evaluate the usability of mobile government services. The attributes were extracted according to the mobility features with consideration of the service category (Government-To-Citizens). By measuring the usability quality of the mGovernment portal by the electronic government agencies, it leads to understanding the degree of usability of the provided services from the public’s perspective.