[Purpose] To investigate the incidence and influencing factors of gastrointestinal cancer in 40 ~69 year-old resident in Shandan County,Gansu Province. [Methods] The survey was conducted from June 2014 to June 2015,stratified cluster random sampling to 40~69 year-old permanent residents for the study. The high-risk groups was screened by collective mission and questionnaires,endoscopy,pathology of digestive tract cancer census method. [Results] The total number of 1500 people screened,the gastrointestinal c...