In order to analyze the certain type artillery coordinator that still has the control problem even when the control program is correct, the electro-hydraulic system of the coordinator is taken as the analysis object, and based on fault tree analysis (FTA), a method which analyzing system failure points is proposed. Analyze system faults and establish a fault tree with the top event of the coordinator control not in place. Qualitatively analyze the fault tree of the coordinator to find its minimum cut set. Quantitatively analyze the occurrence probability of the top event, the bottom event failure probability and importance degree. And analyze the probability of intermediate events in combination with the bottom event. Sort and analyze the probability of failure of the coordinator components. The results show that this method can avoid blind operation and improve maintenance efficiency.