Abstract:Based on niche theory and corresponding measurement methods, this paper uses the data of port industry of Guangdong province during year 2012-2015 to calculate the niche width, overlap, differentiation, et al. The results show that:(1)Seven sub industries can be divided into three types according to niche width: dominant industries, sub dominant industries and auxiliary species industries. Water transportation occupies many regional resources and has the largest contribution to the overall development, but the niche width of shipbuilding industry is too narrow and its contribution is smallest, it''s overall overlap between industries is at a low level. (2)The niche diversity is decreasing year by year, the differentiation is increasing and the competition situation is at a gradual stage.(3)The niche state value is consistent with the descending order of niche intensity, the oil, chemical and power industries are growing at a low level. In general, the development of the water transport industry is good, and the development level of the shipbuilding industry is insufficient.