Abstract:To study the clinical value of fibrobronchoscopy combined with cytology in diagnosis of lung tumors. Methods The clinical data of 80 patients with lung tumors diagnosed and treated from April 2016 to April 2017 were statistically analyzed. According to the diagnostic method, these patients were divided into two groups, the group of fibre bronchoscopy combined with liquid-based cytology (group of liquid-based cells, n = 40) and the group of fibrobronchoscopy combined with traditional smear (group of traditional smear, n = 40). The diagnostic results, diagnostic results of liquid-based cytology and histopathological type, traditional smear group and histopathological type between the two groups were statistically analyzed. Results 30 cases of malignant tumor cells, 3 cases of suspicious tumor cells and 7 cases of no malignant cells were found in the liquid-based cytology group. The positive and negative rates of diagnosis were 82.50% (33/40) and 17.50% (7/40). 13 cases of malignant tumor cells, 8 cases of suspicious tumor cell and 19 cases of no malignant cells were found in traditional smear group. The positive and negative rates of diagnosis were 52.50% (21/40), 47.50% (19/40). The liquid-based cytology group diagnosis in patients with total positive rate was significantly higher than that of traditional smear group (P < 0.05), and the malignant tumor diagnosis positive rate was significantly higher than that of traditional smear group (P < 0.01). The diagnostic rate of squamous cell carcinoma, adenocarcinoma and small cell carcinoma in the liquid-based cell study group was 9.09% (3/33), 12.12% (4/33), 30.30% (10/33), significantly lower than that of tissue biopsy 30.00% (12/40), 32.50% (13/40), 32.50% (13/40) (P < 0.05), and 36.36% (12/33) of non-small cell carcinoma was significantly higher than that of tissue biopsy 2.50% (1/40) (P < 0.01). There was no statistically significant difference between the uncertainty type in liquid-based cells group, 12.12% (4/33) and tissue biopsy uncertainty 2.50% (1/40) (P > 0.05). The diagnostic rate of squamous cell carcinoma, adenocarcinoma and small cell carcinoma in the traditional smear group was 9.52% (2/21), 19.05% (4/21), 19.05% (4/21), significantly lower than that of tissue biopsy 32.50% (13/40), 17.50% (7/40), 45.00% (18/40) (P < 0.05). The uncertainty type in traditional smear group 38.10% (8/21) was higher than tissue biopsy 2.50% (1/40) (P < 0.01). There was no statistically significant difference between the non-small cell carcinoma 14.29% (3/21) and histopathological uncertainty ratio of 2.50% (1/40) (P > 0.05). Conclusion The combination of fibre bronchoscope biopsy and liquid-based cytology has a higher application value in diagnosis of lung tumors than the traditional smear test.