Abstract: Objective To analyze the effect of videoscope-assisted surgery on the symptoms and prognosis in patients with complex anal fistula.Methods Eighty patients with complex anal fistula admitted to our general surgery department from January 2017 to December 2018 were divided into observation group（n=42，minimally invasive videoscope-assisted surgery）and control group（n=38，traditional low cut high thread surgery）according to the surgical plan.The postoperative efficacy and anal dynamic changes，anal function score，pain score，recovery index，and complications before treatment were compared between the two groups.Results The efficacy of the observation group was significantly better than that of the control group（P<0.05）.After operation，the anal canal resting pressure，anal canal diastolic pressure and maximum anal canal pressure were significantly lower than those before operation；the anal canal resting pressure，anal canal diastolic pressure and maximum anal canal pressure were significantly higher in the observation group than in the control group（P<0.05）.The anus sphincter，anal morphology score and VAS score of the observation group were significantly lower than those of the control group（P<0.05）.The hospitalization time，wound healing time，wound area and scar area of  the observation group were significantly lower than those of the control group（P<0.05）.The incidence of postoperative bleeding，dysuria，anal edema and infection in the observation group was significantly lower than that in the control group（P<0.05）.Conclusions Videoscope-assisted surgery is minimally invasive and painful with highefficacy and safety，which can effectively improve the prognosis in patients with complex anal fistula.

Key words: videoscopre-assisted surgery, complex anal fistula, symptoms, prognosis