Based on shift-share method, the author analyses the industrial structure benefit of coastal city of Shandong since 1990. Results indicate that the industrial structure of coastal city of Shandong is not rational in different degree, which results in slow-moving of the economic growth. The industrial structure of Yantai, weihai, rizhao are in lower level, in particular tertiary industry, so it cannot provide much-needed supporting services for rapid development of the second industry. The proportion of the first industry in the economy is extremely large in rizhao, it can't adapt to the new period of industrial structure development trend. Therefore, continual adjustment, optimization of the economic structure and improvement of the industrial quality are needed so as to promote the coordinated and rapid development of economy.