Bùɡuān nǐde shì.
不关你的事。
It's none of your business.
Notes:
不(bù): not
关(ɡuān): be relative to
你的(nǐde): your
事(shì): matter,thing
Example:
A:你明天去参加晚会吗?
     Nǐ mínɡtiān qù cānjiā wǎnhuì mɑ?
     Will you attend the party tomorrow?
B:不关你的事。
     Bùɡuān nǐde shì.
     It's none of your business.
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