I'm an iranian boy who live in malaysia for more than 2 years 26 years old, now I'm in middle of my study and have malaysia student visa, my grandma and uncles live in us for more than 30 years and they are citizen of us, I want to get a visitor visa and come to us for visit them for few days,do I have any chance for getting visa from us embassy in malaysia?

You may apply for visitor visa at US embassy in Malaysia. However, with background as an Iranian, I don't think you would be granted a visa.