The paper introduces the composition and operational process of weapon system of the tripod-launched missile by several soldiers.The error propagation model is proposed, and each error source is introduced briefly.The mathematic model is presented for accuracy analysis to the weapon system.A computing example is given based on actual operational requirements and technological levels of the system/equipment.The calculation result proves the reasonability and effectiveness of accuracy analysis model and the error allocation scheme.The paper provides a support for design and demonstration of the weapon systems target acquisition probability.