Based　on　the　actual　engineering,　the　paper　designs　and　calculates　the　selection,　direction　angle　and　the　tilt　angle　of　the　collector,　and　on　this　basis　to　establish　a　mathematical　model　of　solar　collectors　on　sunny　days.　The　article　simulates　and　analyzes　the　heat　transfer　characteristics　of　All-glass　vacuum　tube　solar　collectors　on　typical　sunny　days.　Through　the　comparative　analyzing　the　curve　of　the　analog　value　and　the　engineering　value　of　the　collector　outlet　temperature,　the　conclusion　is　that　the　trend　of　the　analog　value　and　the　engineering　value　are　consistency.　The　overall　margin　of　error　does　not　exceed　5　degrees　C.　This　model　can　be　used　to　predict　changes　in　sunny　solar　thermal　collector　system　outlet　water　temperature.