With the economic development, the proportion of service industry is going up constantly, which has become a widely accepted rule. Recently, although the economy in our country has almost been kept the leading rising speed around the globe, the service industry has not enjoyed the rising speed as expected and its status in National Economy has not been remarkably enhanced. Apart from the reasons from the economic system, concept, policy and statistic standard in our country, the emergence of this phenomenon must be also related with other economic factors. Based on the statistic data and the method of grey relational analysis, this paper has got the result that for the development of service industry, the most impact factor is the level of urbanization, and then the level of industrialization and the size of urban population, and last but not least, the least influential one is the consumption of urban residents and GDP per capita. Finally, this paper also makes further analysis about this result.