A indication device of achieving successful download of a programmable logic device and a method thereof; a light emitting diode and a current-limiting resistance are connected serially between a power supply terminal and a pin of a programmable logic device chip, wherein, an output signal of the pin is logically assigned by the inside of the chip; when the programmable logic device is not successfully downloaded and has power-on operates, the programmable logic device is in a high-impedance state and the diode is in an off state; after the programmable logic device is successfully downloaded,the assignment is zero or one; an IO pin outputs a low electrical level or a high electrical level to satisfy the positive onset, voltage reduction and lighting of the diode so as to obviously indicate whether the programmable logic device is successfully downloaded or not.