I have entered my all income and deduction, now where do I can find my MAGI income number?

MAGI has different definitions for different purposes, and does not appear on your tax return per se.  Why do you need it?

I have the same question, and it is for IRA contribution

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@Jarm1 wrote:

I have the same question, and it is for IRA contribution

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To calculate your Modified Adjusted Gross Income (MAGI) for a Traditional IRA contribution use Worksheet 1-1 on page 15 of the IRS Publication 590-A.  

To calculate your Modified Adjusted Gross Income (MAGI) for a Roth IRA contribution use Worksheet 2-1 on page 38 of the IRS Publication 590-A.  

IRS Publication 590-A - https://www.irs.gov/pub/irs-pdf/p590a.pdf

Thanks so much