Inclusion Criteria:  high trans-sphincteric cryptoglandular anal fistulas (involving >30% of the EAS muscles evaluated through magnetic resonance imaging (MRI) scan, endoanal ultrasonography) suprasphincteric fistulas were enrolled  Exclusion Criteria:  Low anal fistula; -Non-glandular anal fistulas, such as tuberculous anal fistula and Crohn's anal fistula; - Patients with symptoms of fecal incontinence; A previous history of anal fistula surgical treatment; Patients with malignant tumors or mental illness or other reasons unable to cooperate with the treatment.