With the growing popularity of mobile web service and mobile devices, mobile multitasking behaviour is becoming an important issue for mobile commerce among practitioners and academics. The purpose of this study is to investigate the effect of polychronicity preference, mobile self-efficacy and anxious trait on multitasking behaviour and the multitasking post-behaviour state of mind. The result shows that polychronicity preference has direct influence on users’ multitasking behaviours and negative influence toward easiness state of mobile multitasking post-behaviour state of mind. Mobile self-efficacy has positive influence on mobile multitasking behaviours while anxiety trait only has negative influence on a portion of the mobile multitasking behaviours. Mobile multitasking has direct influence on post-behaviour state of mind.