A time scale is an arbitrary nonempty closed subset of the real numbers by which continuous time and discrete time can be unified into a same framework. In this talk we define the concept of growth rate and elasticity on time scales and discuss their properties. Meanwhile we establish Solow-Swan model on time scales and analyze its equilibrium level and dynamic behavior, especially the impact of time scales structure on economic growth steady state and growth path. The conclusion indicates that steady economic growth needs the support of certain time scale structure, and the total capital stock and steady-state level of output growth rate are no longer constants, but related to the frequency of economic activities. These basic results could be applied to analyze the economic problems with flexible data acquisition time points or those of data missing.