Abstract: In order to explore the methods of the county economic evaluation and fill the blank of the relevant research, this paper selected 3 first grade indexes, 12 second grade indexes to construct the objective evaluation index system about county’s economic development of Yantai City. This paper used the comprehensive index measuring method, to research the basic situation of the county economic development during 2010-2013 in Haiyang, Penglai, Qixia, Changdao, Zhaoyuan and Laizhou of Yantai City. It was founded that the overall situation of county economy in Yantai was as follows: Qixia scored the highest for 0.1084, followed by Haiyang, Laizhou, Penglai and Zhaoyuan, while Changdao scored the minimum for 0.03293. For the years in the study, the highest score was in 2012, followed by 2013, 2010, the lowest score was in 2011. In the first grade indexes, the score of people's living was the highest, followed by economic growth, while economic structure presented the lowest score. In the second grade indexes， the scores of X2 to X9 did not change basically, the scores of X10 to X12 showed a rising trend. The level of county economic development of Yantai had differences, the development between the counties and the indexes at all grades did not balance. So the economic structure needs further adjustment, and this paper put forward some suggestions to accelerate the development of county economy.