OBJECTIVE：To investigate the effects of lidocaine aerosol inhalation on perioperative pulmonary function ， inflammation factor and related complications of patients with one-lung ventilation. METHODS ：A total of 120 patients who were admitted to the Affiliated Hospital of Panzhihua University from January 2018 to May 2020 and planned to undergo partial pneumonectomy under general anesthesia and one-lung ventilation were selected. According to random number table method ，they were divided into lidocaine aerosol inhalation group （group L ）and sterile water aerosol inhalation group （group N ），with 60 cases in each group. Two groups were given Midazolam injection 0.1 mg/kg+Propofol injectable emulsion 2.0 mg/kg+Sufentanil citrate injection 0.4 μg/kg to induce anesthesia. After the insertion of the double-lumen tracheal tube ，group L was given aerosol inhalation of Lidocaine hydrochloride injection 1.5 mg/kg diluted to 20 mL with sterile water ；group N was given aerosol inhalation of sterile water 20 mL at the flow rate of 2 L/min. Patients in both groups were continuously pumped with Propofol injectable emulsion 4-12 mg/（kg·h）+Remifentanil hydrochloride for injection 0.2-1 μg（/ kg·min）+Cisatracurium besilate for injection 0.05-0.1 mg/（kg·h）for anesthesia maintenance. Eight hours after operation ，group L inhaled of Lidocaine hydrochloride injection 1.5 mg/kg diluted to 20 mL with sterile water again ，and group N inhaled of sterile water 20 mL again. Arterial blood gas analysis indexes [arterial partial pressure of oxygen （PaO2），partial pressure of carbon dioxide （PaCO2），lactic acid （Lac），oxygenation index （P/F）]，serum inflammatory factors [interleukin 6 （IL-6），tumor necrosis factor α（TNF-α）and nuclear factor κB（NF-κB）] were observed in 2 groups before anesthesia（T1），60 min of one-lung ventilation （T2），and 12 h after extubation （T3）. Respiratory and circulatory parameters [extravascular lung water（EVLW），pulmonary vascular permeability index （PVPI），heart rate （HR），stroke volume （SV）] were also observed 5 min after anesthesia （t1），T2 and 15 min after surgery （t3）. Extubation time ，visual analogue scale （VAS） score of 12 h after extubation，time of getting out of bed ，the incidence of throat pain of 12 h after extubation and the occurrence of ADR were recorded in 2 groups. RESULTS ：There was no significant difference in arterial blood gas analysis indexes ，serum inflammatory factor levels ，respiratory and circulatory parameters between the two groups at T 1 or t 1（P＞0.05）. The levels of PaO 2，PaCO2， Lac，IL-6，TNF-α and NF-κB in 2 groups at T 2 and T 3 were significantly higher than at T 1，P/F at T 2 and T 3 was significantly lower than at T 1；in group L ，the levels of PaCO 2，Lac，IL-6，TNF-α，NF-κB were significantly lower than group N，and PaO 2 and P/F were significantly higher than group N （P＜0.05）. EVLW and PVPI of 2 groups at T 2and t 3，SV of group L ，HR of group N were significantly higher than corresponding group at T 1，while EVLW ，PVPI and HR of group L were significantly lower than group N，SV was significantly higher than group N at corresponding period （P＜0.05）. The extubation time ，VAS score of 12 h after extubation，time to get out of bed after surgery ，the incidence of throat pain of 12 h after extubation in group L were significantly shorter or lower than group N （P＜0.05）. No obvious and serious ADR occurred during recovery. CONCLUSIONS：Lidocaine aerosol inhalation can effectively improve ventilation and oxygenation function of patients undergoing one-lung ventilation ，inhibit the release of inflammatory factors ，and reduce the incidence of postoperative complications with good safety.