Most results obtained in the research of hybrid control systems are
related to the description and analysis of hybrid control systems. But
it is doubtless that how to design a hybrid control system is of great
significance in the research of hybrid control systems. This paper is
devoted to discuss the design methodology of hybrid control systems.
After an introduction of a new framework of hybrid control systems, a
top-down design approach is proposed which is consistent to the
framework. The approach consists of decomposition of system
performance specifications, the design of discrete event driven
decision maker and the design of digital control loops.  Two examples,
a gas burner and an inverse pendulum are systematically designed to
show the goodness of the top-down design approach. Finally, a
bottom-up analysis approach which is consistent to the new framework
is proposed and then applied to these examples.