Based on abundant investigations and practical experiences, reasons for poor air-tightness of granary were analyzed and viable suggestions were provided，including selection of reasonable granary building structure, high-quality outsourcing parts and strict control of construction quality. The measures as “raising technical standard and eliminating the unqualified enterprises, increasing the investment for construction and building high quality granary, strengthening the combination of architectural design and storage technology, abolishing gradually the use of film as air-tightness of granary” were carried out and the supports in the aspects of design, technology and fund were provided for construction of new granary. The problem of using granary film for air-tightness when fumigation or controlled atmosphere storage was resolved properly. Thereby, the traditional air-tightness for granary would be fundamentally changed, and the granary with good quality, high efficiency and low energy consumption will be promoted.