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to listening to teachers who always read the average speed in daily life, or used to slow conversation with their partner while practicing oral English, so they cannot suit the speed of normal speed listening materials. 2.3 Vocabulary Nowadays, many students feel that vocabulary is a salient problem that hinders their listening comprehension. “Vocabulary is the major component of language; people always compare vocabulary to building material. For every English learner, study English without a certain amount of vocabulary is just like builders building houses without bricks.”[10] Vocabulary plays an important role in the English learning. Every dialogue and passage in listening comprehension is made up of sentences, while the basic unit of sentence is word or phrase. During the process of listening, listeners should not only do the exercises of sound recognition, but also grasp the language continuity. Definitely they will meet some difficult words while listening, especially when the topic is not so familiar with them .If a new word appeared while listening, they will find it difficult for them to understand the whole meaning. Even some students stop to think about the new word they met and can no longer concentrate their attention on the incoming information, in this case, they will miss the next step of speech and can’t understand the whole passage well. For example: (17). M: You were seen hanging about the store on the night when it was robbed, weren’t you? W: Me? You must have made a mistake. I was at home that night. Q: What are they talking about? If students are unfamiliar with “hanging about” and “robbed”, they will be at a loss and can not know what the dialogue is about, which will lead to select a wrong answer. Thus, mastering a certain amount of vocabulary is an important basis for listening, for vocabulary is the basis of language and it influences listening directly. It cannot be doubted that lack of the necessary amount of vocabulary will lead listening comprehension to failure. 2.4 Grammar Grammar is another important factor influences listening comprehension. Systematic grammar knowledge is like a strong frame of a building, it can help students to catch the implication of vocal sounds, and understand them well, and it also can tell students the tense, voice and mood. For example: (18). W: Do you enjoy majoring in mathematics? M: Enjoy? If I could choose again, I would study biology. Q: What do we learn about the man from the conversation? If students know the subjunctive mood and rhetorical question quite well, after hearing the sentence, immediately they will know the man doesn’t like mathematics at all, he likes biology. Today, there are so many students lack solid grammar knowledge so that they feel listening is quite difficult. Students know every word in the listening, but they can’t understand what the speaker means. It will directly affect their achieving good results while listening. 3. Non-linguistic obstacles in the process of listening comprehension Non-linguistic obstacles refer to the obstacles that affect listening comprehension and have nothing to do with the linguistics, such as limitation of background knowledge, bad listening habits, psychological factors and memory barriers. 3.1 Limitation of Background Knowledge The big differences between the East and the West will greatly influence the listening comprehension. The background knowledge is indispensable in listening comprehen