This study aims to investigate the effects of various types of input modification on English listening comprehension by Korean high school students. The participants of the study were assigned to three different types of listening input: one time listening, repetitive listening, and elaboration. They listened to five types of genres such as descriptive, narrative, comparison/contrast, causal/evaluation, and problem/solution This study examined how these different types of input and genres affect the students’ listening comprehension in terms of comprehension of main ideas and details, and inference, The results of the study revealed that different types of input modification and repetition influenced the students’ listening comprehension. For instance, repetitive listening and elaboration did not have a significant effect on the high-level students’ listening comprehension, whereas these types of input resulted in improvement in the low-level students’ listening comprehension. In addition, different input types had effects on the students’ listening comprehension according to the students’ proficiency levels. On the basis of the results, some pedagogical implications on the teaching of listening skills are presented.