Can anyone let me know how to use the Ki ,and the basic meaning, i checked in the dic, but too many meaning, can you show me the basic meaning and show me some expample , thank you so much!

This website has a very good explanation, and it is easy to follow. You should check it out

thanks for your website, but i can not open it always, i knew this one before, and sometimes can open, sometimes not, so would anyone just explain here for me, just 5 sample for me is ok, thank you very much and good luck !

Which "ki" do you ask?

Even we Turks don't know which is for what. We just use them without paying a little attention. "ki" is always something like a junction, or merger. There are some types of "ki"s for sentence merging, and some for words merging.

In English, you are putting the prepositions before the noun. In Turkish, after it. And if you want to mention something which is in a special place, you put them one after another:

the car in the garage

As you know, Turkish has generally "the reverse logic" We put these two groups in the reverse order:

[in the garage] + [the car]
garajda + araba

On the other hand, Turkish is much more flexible language. So we can change the order and it will me meaningful too. But it won't be clear if these two words are related or not.
So we have to say that [in the garage] is related to the other word, and we need to show it by putting the "ki" which is written together:

garajdaki araba

another ki which is written together as well is the suffix to make it clear "which is whose"

For example, we are talking about our pens, and I dont want to mention "pen" again and again. We say: "yours" instead of "your pen" or "mine" instead of "my pen".

seninki yours
benimki mine

And what about the others? "Ahmet's":
Ahmet'inki
Mehmet'inki (we dont say "kalem" after benimki or seninki or Ahmet'inki)
(They are not related to junction or merging.)

See also:
http://turkishlanguage.co.uk/sifat.htm

And the last "ki" is very different. It is for sentences, so we have to write is separated as if a new word. But this is also a very big topic.

See this:
http://en.wikipedia.org/wiki/Turkish_vocabulary#The_conjunction_ki

or there are somethings from Redhouse:

1. that; who; which:
Bir şey yapmadım ki pişmanlık duyayım.
I haven't done anything that I should feel sorry about.

2. so ... that; such ... that:
Öyle ucuz ki herkes alabilir.
It's so cheap that everyone can afford it.

3. -what do you know!-, -would you believe it?-; -son of a gun!-: (*)
Eve geldim ki kapı duvar.
I came home, but -would you believe it? -nobody answered the door.
Elimi cebime attım ki mangiz nanay.
I felt in my pocket for it, but -son of a gun! -the dough wasn't there.

4. seeing that, considering that:
Adam üşÃ¼müş ki paltosunu giymiş.
The man must have been cold, seeing that he put on his coat.

5. as, though:
Cevap vermeseydi bile -ki verdi- iş olacağına varırdı.
Even if he hadn't made a reply -though he did- the thing wouldn't have turned out any differently.

6. when: (*)
Henüz uykuya dalmıştım ki, bir patlama oldu.
I'd just dropped off to sleep when something exploded.

7. ..., I wonder?: (*)
Bilmem ki ne yapsam?
What should I do, I wonder?

8. indicates frustration, disapproval, doubt, or anxiety:
O bana inanmaz ki!
She will not believe me, so why should I talk with her?

9. used for emphasis:
Öyle güzel ki!
It's more beautiful than I can say!

Note: 3 and 7 are some unique/extreme examples. 6 is very rare usage as well.

1, 2, 4 ,8 and 9 are very common. I think you should learn them first

Kolay gelsin

Wow, thank you very much caliptrix. I was wondering about this "ki" also... Your explanations helped me a lot.

thank you so much, i mean this ki