Creep Rate Spectroscopy (CRS) [1] is an original high-resolution method of thermomechanical analysis of solids based on the use of a laser-interferometric creep rate meter (LICRM) setup to record the deformation response of a solid under study to the applied load over the broad temperature range. The LICRM setups, developed in our lab, are based on utilizing a Michelson interferometer and Doppler effect. They are the optical-electronic devices combined with the setups for mechanical loading, under uniaxial tension or compression, of solid samples. CRS provides measuring ultra-precisely a creep rate at small mechanical stress, typically much lower than the yield or breaking stress, as a function of temperature, over the range from 100 to 800K. LICRM setup allows one to register precisely creep rates on the basis of deformation increment of as low as 150–300 nm. As a result, the obtained, typically non-monotonic, temperature dependencies of the rate of small inelastic deformations are designated as the "creep rate spectra". CRS has been successfully applied by us to solving various problems of materials science and solid state physics. It was applied to polymers, metals, ceramics, nanocomposites, etc.; the most attention was paid to polymers because its behavior is best suited to the specificity of this method. This approach provided new experimental possibilities and superiority in resolution compared to the conventional thermal analysis, relaxation spectrometry and mechanical testing techniques. Amongst them are as follows: (a) a discrete analysis of dynamics (dynamic heterogeneity) at different temperatures; (b) studying creep on submicro-, micro- and meso-scales; (c) new possibilities for the precise analysis of creep kinetics of materials in any temperature point and at any stage of deformation process; (d) studying the peculiarities of polymer dynamics in composite materials including dynamics at interfaces; (e) analysis of microplasticity, relaxations, and phase transitions in brittle materials; (g) using creep rate spectra for non-destructive prediction of temperature anomalies in mechanical behavior of materials, etc.