Are you neverous nervous when you talked with native speaker in English?

(You used past tense for the verb "talk." There are two ways to fix this. If you are really asking the question in past tense, then change "are" with "were."  If you are asking the question in general, then change the past tense to simple present tense.)

It might be the common issue in China. I can read an (Don't forget to add a/an/the before most nouns, especially if it's a common noun) aricle article or write many words in English, but when I speak out, my brain is becomes (when expressing change, use "become" instead of "is" because "is" just states the condition whereas "become" shows the change) blank or extramly extremely active inactive (I think you mean inactive?). When i I (always capitalize "I") want to say something/express myself in English, my brain will search for (The conjunction "for" is usually added with the verb "search" or "look" when you are finding something.) which word and which grammer i shoul grammar I should use. Then nothing will come out from me, or if I speak word by word (For this case, you need "if"), or absue grammer abuse grammar (Ummm... this sentence is hard to understand. Do you mean that either no words will come out from you or you can say something, but often it's the wrong words and grammar?). How can I beat this issue? And (You can skip "and" here. "And" is mostly not a first word used in a sentence after a question.) I don't know the person who is talking with can unstander me if the person [who I'm talking to/who is talking to me] can understand me. (When using an example in a sentence, add the "if" conditional. Also, the person I am talking to = the person who's talking to me. It just depends on how you would want to construct the sentence.)

Hope this helps~! I hope my explanation wasn't very confusing.

Are you nervous when you talked with a native speaker in English?

It might be a common issue in China. I can read articles  or write many words in English, but when I speak out, my brain is blank or extremely active. When I want to say something\express myself in English, my brain will search which word and which grammar structure I should use. Then nothing will come out from me, or I will speak word by word, or abuse grammar rules. How can I beat this issue? And I don't know if the person who I am talking with can understand me.

Don't worry. The only way to learn to speak is to practise. There are a lot of nice people on this site who, if they do not understand you, will ask you to repeat what you said.