Reliability of military meteorological materiel packaging was analyzed systematically using fuzzy fault tree analysis method. The basic theory of fuzzy fault tree was introduced. Fuzzy failure probability of fault tree bottom event was evaluated using expert estimation method combined with fuzzy sets theory. A packaging system fault tree was established with an instance of TFS-1 ventilated psychrometer packaging. Minimal cut sets causing top event happening was solved using descending method. The happening probability of top event was obtained to be 0. 0705 and the importance of bottom events was calculated. It was concluded that the method has important significance for improving the reliability of military meteorological materiel packaging and insuring materiel quality.