Based on setting up the comprehensive evaluation index system， this paper makes a practical evaluation on interactional development of new industrialization and new urbanization (‘two modernization’) of Mianyang’County Regions. The evaluation results indicate: though the overall levels of interactional development of ‘two modernization’are comparatively low， but there are significant differences among county regions; favorable interactive development between ‘two modernization’have presented in the Fucheng Region， but have not appeared in the other 8 county regions; on the condition of comparatively low industrialization level， new urbanization obviously lagged on new industrialization; the difference?of traditional index?scores of industrialization and urbanization? is?relatively?small among county regions， but very large in the‘new’factors; every county region should concentrate their efforts on the‘new’factors， and ?pursue a path of favorable interactive development between‘two modernization’according to their characteristics.