The reasonable result for the grey correlational analysis is depends mainly on the procedure of data preprocessing. Due to the nature of the attributes-dimensions, grade and the polarity, the comparability becomes the essence in the data preprocessing. By this reason, a different concept will be proposed in this paper, in order to prevent the data distortion. First, a new procedure, called ”quantity processing”, is presented to processes the collected data before preprocessing. Also, a new approaching of grey correlational analysis also proposed, and an illustration, ”The bid for highway construction” will be used to present for the explanation. As the result, it indicates our proposed will not distort our data, and can have the reasonable result.