ITR selection.

It depends on the Type of Income for the concerned financial year

If i have income that have to show in ITR 3 so can i choose this form..

Yes, you can choose different form for different year as per your source of income..
1. If you have salary income, one House property income and others sources income than required to file ITR 1.
2. If You have Capital Gain income along with Above mentioned income than required to file ITR 2
3. If You have business income than required to file ITR 3 and ITR 4 as the case may be..
ect.....

Choosing a itr depends on the nature and source of income.
As a result income earned during the previous year pertaining to the relevant assesment year has to be correctly reflected and hence it is being done.