Use scientific methods to assess missile equipment acquisition risk can improve the efficiency of t missile equipment acqui-sition. Built dynamic models of missile equipment acquisition risk assessment index weight, amend index weight through inter-rela-tionship of index, created variable weight fuzzy model of missile equipment acquisition risk evaluation, amended the index weight the size by index value. Finally used an instance to confirm the model. The results show that the model can response the missile e-quipment acquisition risk size.