The disclosure relates to a projection system and an operation method thereof. The projection system includes a central control platform and a projection apparatus. The central control platform generates a sequence signal according to a self-defined setting. The projection apparatus is coupled to the central control platform and includes a power circuit, a first processing circuit, and an optical engine module. The power circuit passes the sequence signal through an energy storage element to generate a power supply. The first processing circuit performs an operation based on the power supply to generate a decoding result according to the sequence signal. The optical engine module obtains image information according to the decoding result and generates a display image according to the image information.