By taking the 22 barren hills for suitable afforestation in the Yuntai Mountains of Lianyungang City as the research object, 16 site factors were selected and divided into macroscopic and microcosmic factors to conduct site quality classification and assessment, respectively. In the end, the classification and assessment results were combined. Results are as follows: The 22 hills could be divided into five types. The main features of the first type, consisting of 2 hills, had a medium or superior thickness of soil layer, relatively fine site quality of macroscopic factor and medium soil quality; the second type, consisting of 4 hills, a medium or superior thickness of soil layer, relatively fine site quality of macroscopic factor and poor soil quality; the third type, consisting of 7 hills, a medium or inferior thickness of soil layer, relatively medium site quality of macroscopic factor and medium soil quality; the fourth type, consisting of 7 hills, a medium or inferior thickness of soil layer, relatively medium site quality of macroscopic factor and poor soil quality; and the fifth type, consisting of 2 hills, a very thin thickness of soil layer, relatively very poor site quality of macroscopic factor and medium soil quality. In summary, the site quality in the research area is not fine as a whole, and afforestation will be very difficult in the future.