A method for acquiring air leakage amount of a positive airway pressure breathing apparatus includes the following steps. Firstly, a transformation formula for transforming pressure into flow is established. Then, a pressure datum measured by a manometer of the positive airway pressure breathing apparatus is transformed into a flow datum through the transformation formula. Next, an air leakage amount is acquired by calculating a difference between the flow datum and a standard flow datum. Besides, a positive airway pressure breathing apparatus using the air leakage acquiring method is provided. A cost of the positive airway pressure breathing apparatus can be reduced by the method. Moreover, a positive airway pressure breathing apparatus which can transform the pressure data into the flow data is also provided.一種陽壓呼吸裝置之漏氣量的取得方法包括下列步驟。首先,建立壓力與流量的轉換公式。接著,藉由壓力與流量的轉換公式將陽壓呼吸裝置的壓力計測得的壓力資料轉換成流量資料。然後,計算流量資料與標準流量的差異以取得漏氣量。此漏氣量的取得方法可降低陽壓呼吸裝置的成本。此外,本發明另提出一種可將壓力資料轉換成流量資料的陽壓呼吸裝置。S210~S230...步驟
