An adjustable hierarchical scoring method is disclosed. A hierarchical scoring structure for speech-sound data is generated. Historical data of speech-sound scoring for the speech-sound data is retrieved from a speech-sound practice database while a professional scoring result for the hierarchical scoring structure of the speech-sound data is being collected. A weight-adjusting operation is performed according to the historical data of speech-sound scoring and the professional scoring result to calculate optimum adjusting weights for each layer of the hierarchical scoring structure. Retrieved speech-sound data of a student is scored using a speech-sound scoring system and a weighted average operation is performed to the score of the speech-sound data of the student according to a corresponding adjusting weight, thereby generating the final score of the speech-sound data of the student.