The present invention discloses a method for dynamically detecting writing quality of a recordable optical disc. According to the method, firstly a current detecting position located on a program area of the recordable optical disc is set. Then the recordable disc drive proceeds data recording in the program area with an optimal write power. The recordable disc drive paused data recording when a recording position exceeds or is equal to the current detecting position. Then the recordable disc drive reproduces pre-recorded data in the tracks of the recordable optical disc to perform OPC for modifying the optimal write power and calculating a jitter value. Thereafter a following detecting position is modified based on the jitter value and data recording is restarted in the program area with the modified optimal write power until the recording position exceeds or is equal to the modified following detecting position.