Structural changes occurring in the ordering process of crystalline polymers have been investigated by combining various such kinds of techniques as X-ray scattering, infrared and Raman spectroscopy, etc. The methods to perform the time-resolved measurements under quick and stable temperature jumping process between two fixed temperatures, for example, were reviewed. Application of these techniques was made for the structural studies of isothermal crystallization of polyethylene, solvent-induced crystallization of syndiotactic polystyrene, photo-induced solid-state polymerization of muconate ester, polymerization reaction of 4-vinyl pyridine on the electrode surface, gelation process of syndiotactic polystyrene and poly(vinylidene fluoride), and so on. Usefulness of simultaneous measurements of different types of apparatus has been shown for the various cases of phase transition. Concrete examples were given for the simultaneous measurements of X-ray diffraction and Raman scattering, small-angle and wide-angle X-ray scatterings, and infrared spectra and viscoelastic property.