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Objective: To observe the effect of respiratory-function changes on urinary output and expression of aquaporin (AQP) in kidney tissue in bronchial asthma (BA) model mice. To explore the correlation between the lung controlling breathing and the lung regulating the waterways, and observe regulation by the lung-diffusing herb platycodon root (Platycodon grandiflorus (JACQ.) A.DC.). Methods: Forty-five healthy female Balb/c mice were divided randomly into normal, model and platycodon root groups. The BA model was replicated by complex sensitization and stimulation with ovalbumin (OVA). Changes in airway resistance were detected using an AniRes2005 system, and 24-hour urine output collected by metabolic cages. Histopathologic changes in the lung and kidney were observed by H&E staining. Expression of the mRNA of AQP1 and AQP2 was detected by reverse transcription-polymerase chain reaction, immunohistochemistry, and immunofluorescence. Results: Compared with the normal group, airway resistance in the inspiratory phase intensified in the model group (P < .01). Following the pathologic changes in lung tissue, but no significant change in kidney tissue, 24-hour urinary output decreased significantly (P < .05), and levels of AQP1, AQP2 and their mRNA increased significantly in the model group (P < .01). Compared with the model group, airway resistance in the inspiratory phase was weakened (P < .01). The urinary output increased (P < .05), pathologic changes in lung tissues decreased, and renal expression of AQP1, AQP2 and their mRNA decreased significantly (P < .01) in the platycodon root group. Conclusion: Changes in respiratory function in BA model mice can affect how the lung regulates water pathways. Platycodon root diffusing the lung can ameliorate the respiratory-function and pathologic changes in the lung tissues of BA model mice, but also regulate urinary output and renal expression of AQP1 and AQP2.