The coupling of Hard-Core technology and traditional industryis helpful for synergic development. Based on the grey relational model, theHard-Core technology and traditional industry of Xi’an is investigated. Therelevance of aerospace, electronic communication, medical equipment andsemiochemistry and regional economy, and the correlativity between Hard-Core technology and traditional industry are investigated. The results indicatethat the related coefficient interval lies in 0.75-1, which is higher level. Therelationship between four major industries and regional development variedfrom high to low as such sequence: aerospace, electronic communication,medical equipment and semiochemistry. The government should improve thecoupling effect of Hard-Core technology and traditional industry.