文档介绍：IELTS speaking – band scores explained
How is your IELTS speaking band score calculated? This is an important question for any IELTS candidate because many mistakes can be avoided by knowing what the examiner is looking for and how your speaking is graded. This post gives you a brief outline of the grading criteria, how band scores are calculated and how examiners typically grade the speaking.
The 4 grading criteria
Fluency and coherence 流利程度和连贯性
How fluently you speak and how well you link your ideas  together
Pronunciation发音
How accurate your pronunciation is
Lexical resource词汇
How accurate and varied your vocabulary is
Grammatical range and accuracy语法结构多样、准确
How accurate and varied your grammar is
What do these criteria mean?
This is IELTS and IELTS examiners are trained to interpret these criteria in a particular way. In theory it should not matter where you take your test as all examiners grade consistently. I suggest you should spend time understanding the detail here as that way you can avoid many common mistakes.
One main point is that in all the criteria a key idea is being clear. The main idea is whether you can express yourself clearly so that someone else can understand you.
雅思口语最重要的一个评分点是：要说清楚！你能不能表达清楚直接影响到别人能不能听懂你的话~
Fluency and coherence
Fluency is a combination:
流利程度指的是：
speed of speech 语速
length of answer 答案的长度