To study the decision-making analysis of signal simulation, the method of the confidence interval is adopted to analyze the consistency of signal characteristic parameter. The matching problem of the confidence interval which comes from simulation sampling and the acceptance interval is discussed, which perfects the method of the confidence interval; Then, a deviated function is given about the confidence interval to the acceptance interval, which can increase the debugging efficiency of simulation model. Based on this, a decision-making analysis model of signal simulation based on the confidence interval is put forward. Finally, an example applied in the simulation of underwater target radiated-noise is taken into explanation. It illustrates that the model can scoop out a plentiful of useful information richly, which comes from simulation sampling and can provide auxiliary decision-making for the simulation model VV&A and then increase the credibility of simulation.