My English is not very good, but I’m going to ask the question.
I’m using Unity 3.1.0f4 .
My lightmapping options,
Lightmapping look after,
What should i do. 
I’m assuming the problem is the artifacts near the objects?
That resolution seems insane.
Are you lightmaps compressed?
You could also raise the final gather rays a bit.
Now, i’m using final gather rays=5k 
What about compression? Are your lightmaps compressed?
Also, you didn’t answer me, why is the resolution so insane? Is your scene extremely small?
How can I do. I do not know
I’m try very big scenes and look bad. My English is not very good.
Click on Maps and see if the compressed checkbox is checked. If it is, uncheck it and see if it makes any difference.
Thank you very very much 
My problems is resolved 
Thank you man, i had the same problem all day, and this seems like fixed for me too!