I am a us citizen and in addition i have also the iranian passport as second citizenship.

I have been invited by a chinese company(goverment company with having right to invite foriegners)to visit china for to discuss business and visit their factory on july 15th to july 30th. Can i travel with my iranian passport and enter in china with official invitation and geting visa at the intry airport?Can i take the invitation letter with me by intering in china and apply visa at airport?
Thanks
Seyed yahya sameni tel.+1 7274883344
Regards
S.e.sameni