Failures or defects in a product will influence its quality a lot. Reducing or eliminating failures and defects in product design phase is an economical way. FMEA and BFA are two kinds of methods. By using them, the product quality and reliability can be improved in the design phase. This paper introduced a new kind of failure analysis method which was developed based on FMEA and BFA. This is a network failure model and analysis method. By using this method, the product quality could be improved and failures could be reduced.