Based on the samples of five industry clusters of engineering machinery and seven core enterprises in China, the influ- ence paths of core enterprises in the industry clusters of engineering machinery on the economic output of cluster were studied by structural equation model. The results indicated that not only was the direct influences of enterprise scale on the cluster output hard to be evaluated, but also there were positive influences of the enterprise scale in the indirect way and the enterprise ability in the direct way on the cluster output. Therefore, in China it is extremely importan...
