Diversified industrial combination of state-owned enterprise is often not optimal, it can also maintain in the industry boom, but once the main market atrophy, the entire firm’s development will be in trouble, such as coal business groups. To solve this problem, this paper use industrial synergy as an intermediary variable and develop the traditional dualism, which is the relationship between diversification and firm performance, to trialism, which are relationships among diversification, industrial synergy and firm performance and take coal enterprises listing Corporations as an example to analyze relationships of above three points. Results show vertical business synergy in related diversification and horizontal function synergy in unrelated diversification are all have a significant positive impact on firm performance. This conclusion is confirmed the important hypothesis in theory that industrial synergy will promote firm performance and has important practical significance to guide state-owned enterprises’ management practice.
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