In order to avoid the risk of all stages of military equipment acquisition, especially the development stage, the improved risk matrix is used assessing the developing stage’s risk of certain new hand grenade acquisition. The establishment of new hand grenade acquisition risk judging indicators is discussed from the following three aspects: performance risk, expense risk and progress risk. Risk assessment expert-group is invited to assess the developing stage’s risk of the hand grenade acquisition; and with the combination of the direct result given by expert-group, every risks’ ordered value, risk frequency ordered value and Borda value of developing stage’s risk effect are figured out, the information about Borda ordered value and risk grade scale are then acquired. The total risk level and every risks’ contributing percentage in the stage of development of this hand grenade are then figured out. Finally the biggest risk factors, which have profound effects on this equipments’ development, are given out.