  A hybrid system is a dynamical system with both discrete and continuous
components. In order to study the modeling and verification aspects of hybrid
system, in this paper we first introduce a specification approach combining
interface automata, initialized multirate hybrid automata and Z language, which
is named MZIA. Meanwhile we propose a refinement relation on MZIAs. Then we
give an algorithm for checking refinement relation between MZIAs with finite
domain and demonstrate the correctness of the algorithm.
