This study aimed to investigate characteristics of English summary skills of Korean college freshmen. To achieve this aim, 120 English summary writings were collected from an English diagnostic test for college freshmen. Two texts with different features were used for the test. Text A is a persuasive essay with a problem/solution structure, and Text B is an expository essay with a collective structure. Fifty-three students summarized Text A and the others Text B. For each of the text groups, students were classified into two groups by their summary level. In the analysis of the writings considering the genre of the original text, organization, and adherence to summarization rules, it was found that the learners summarized the persuasive essay better than the expository essay. The high-ability group used various transition words and followed the structure of the original text when they organized their writings. As for summarization rules such as invention, selection, and paraphrasing, Text A group did not show any difference in their creation skill of topic sentence between the high- and low-ability group. On the other hand, the high-ability group that read Text B was better at creating general sentences than the low group. There was not a significant difference between the high- and low-ability groups in their paraphrasing skills, Text A group in general performing better than Text B group. Further suggestions and pedagogical implications are discussed.