A good baseball pitcher has a huge impact on the game because of the pitcher suppressed the opponent's scoring more efficient. The adolescence is a critical moment for baseball pitcher development with the future. Therefore, this study uses questionnaires to investigate outstanding baseball coaches' opinion of selection criteria for adolescent pitchers, and uses the Delphi method to filter selection criteria. This study reduced the initial 37 criteria to 31 criteria, reducing the complexity of judging talents. As the result, it can provide a more accurate basis for baseball coaches to selection adolescent pitchers.