Who can use itr -1?

Yes. Salaried person can file ITR-1

Make sure that he does not have exempt income eg. conveyance allowance, dividend, agriculture income exceeding Rs 5000/-.

Who can file Income tax return in Form no SAHAJ- ITR 1

1. Individual having salary/pension income, income from one house property and income from other sources except income from lottery or from horse races. There should not be any Income from business or profession or capital gains.
2. Who has no loss under the head Income from other sources
3. Person who is resident, other than not ordinarily resident in India if such person has no assets (including financial interest in any entity) located outside India or such person does not have signing authority in any account located outside India.
4. Individual who is not claiming any double taxation tax relief under sections 90 or 90 A or 91 of the Income-tax Act, 1961.
5. Who does not have exempt income eg. dividend, agriculture income exceeding Rs 5000/-.