This invention discloses a curve movement control system of large-bore astronomical telescope's azimuth axis. It includes an epistatic computer system and a hypogynous computer system. The epistatic one is connected with the hypogynous one through serial communication. The hypogynous one is made up of a DSP module, an executive electric engine, a signal collection, comparison link and a position data processing SCM. It is characterized in that the telescope's executive electric engine is a circular electric engine; the engine is connected with the drive circuit and protective circuit; the signal reversing collection and comparison link are both set with the absolute coder used for the inverting of circular electric engine and the incremental coder used for position detecting of circular electric engine; coder's signal is exported to the DSP module through the position data processing SCM; drive circuit adopts digitized intelligent drive power module; the PWM of DSP module is exported to it to control the circular electric engine's revolution. This invention can meet the need of long-time and high-precision tracing and observing all kinds of celestial bodies, and also can meet the need of precise and board-timing parameter.