In order to solve the problems exiting in the condition assessment of tank fire control system, such as bigger subjectivity and less accuracy, the health assessment of fire control system based on entropy weight method is studied. Health index model is established on the basis of index system of health assessment. According to the index attributes, the indexes with different dimensions are normalized. The weight of each index is computed by using entropy weight method. Finally, the method is used to assess the health condition of tank fire control system. The assessment results show that stability indexes are the important one that has influence on the general performance of fire control system. It is also proved that the assessment result is reliable and is able to provide some guidelines for the usage and maintenance of fire control system.