Abstract： Immature bitter orange is well known for its effect of breaking stagnant qi and dispersing accumulation， as well as dissolving phlegm and dispersing pǐ . However，there is little discussion about its effect of boosting qi and raising the clear. Its effect of boosting qi should not be ignored. Studying the words of ancient physicians，following the prescription of effective compatibility， and abiding by the case of contemporary famous doctors， this paper discusses the effect of immature bitter orange on boosting qi，and expounds its main meaning.