Reference-Scale Estimation method based on paired comparison is one of sound quality subjective evaluation methods. This method need to use paired comparison method to sequence all of sound samples before Magnitude Estimation to establish standard noise sample. This process is very cumbersome with great labor intensity. In order to eliminate this step, this paper has proposed a human era model to achieve preliminary noise classification and establish reference noise sample in each category automatically. This paper has also chosen 24 noise samples from 8 driving cycle of Fuel Cell Vehicle (FCV) as examples to introduce the main theory and prove its effectiveness.