  In this report, we discuss the measurement of the hadronic decay modes of
resonances in relativistic heavy-ion collisions, emphasizing on RHIC results.
The study of resonances can provide: (1) the yield and spectra of more
particles with different properties to study whether the system is in thermal
equilibrium; (2) an independent probe of the time evolution of the source from
chemical to kinetic freeze-out and detailed information on hadronic interaction
at later stage; (3) the study of medium effects at late stages of the
collisions; (4) a measurement of flavor and baryon/meson dependence of particle
production at intermediate $p_{T}$ ($>2$ GeV/$c$).
