To evaluate the effectiveness of the industrial Internet platform(IIP) applied by manufacturing enterprises, this study proposes a set of assessment systems for guiding and standardizing the application of IIP. Our assessment framework is established based on five dimensions: strategy and organization; basic conditions; platform application; business innovation; and efficiency and benefit. We collect IIP application data from more than 1400 manufacturing enterprises in China. The application performance of the IIP in manufacturing enterprises were comprehensively analyzed from different perspectives such as equipment on the cloud, industrial knowledge accumulation and reuse, and industrial APP innovative application. The research results show that the overall score of IIP application in China is 31.76 according to our assessment criterion. The breadth and depth of platform application need to be improved. Furthermore, this study provides guidance to a wide range of potential market participants, such as manufacturing enterprises, service providers and relevant policy makers, to assess the effectiveness of platform application.