Potential Intention Detection aims to detect implicit intention by user behavior, so as to understand the real intention of the users at a higher level. A human-computer interaction model as well as the corresponding technical framework for intention understanding and reasoning is presented under multi-domain data environment. An extension of Dynamic Intention Structure (DIS) is proposed to adapt to the requirement of multi-domain data and interactive reasoning. A set of interactive primitives is provided to regulate human-computer interface. The technical framework makes it technically possible to implement a system to deduce potential intention.