In order to evaluate the tank target’s value reasonably, the evaluate model of tank target is built. The indexes are separated into two kinds: quantificational indexes and linguistic indexes. A new conversion method is used to normalize the quantificational index. The cloud model of evaluation rules about linguistic index are built through cloud theory, and then translate the qualitative linguistic words into quantitative values with uncertain illation. Thus the sequence of target value is obtained by calculating the evaluation value combined with the weight of the indexes. Finally, a practical example shows that this method is scientific, reasonable, in accordance with the practical situation and has better application foreground in tank command control system.