The integrated statistical computing environment, IEAST (Integrated Environment for Analyzing STARMA models), was designed for analyzing and modeling the stochastic processes based on general Space-Time AutoRegressive Moving Average (STARMA) models in two-dimensional gridded space. This system was developed on RedHat Linux 9.0 using the GNU OCTAVE v2.1.40 as the development language. Because of source code compatibility, IEAST can be easily run under Windows/Unix/MacOS operating system. Besides menu-driven selection, a programming environment is also provided for flexibility and automation. This is the first software for space-time ARMA modeling.