The study dedicated to the issue of human-computer interaction (HCI) for an E-bookstore. The study aimed to implement a usable mobile commerce website based on the required features of personal digital assistants (PDAs). The related information has been collected and analyzed for ensuring to match the criteria of HCI design. Further, a cross hetero-interface and transferable mechanism is also included here. It might be suitable for communicating compatible information with heterogeneous platform of system and sharing data by XML technologies for PDA. This study expects that users can fulfill the transaction of commerce pleasantly for mobile access and toward the development of mobile commerce.