Nuctech is a leading supplier of airport security scanners
Namibia is investigating allegations of bribery over a government contract with a Chinese state-owned firm that has links to President Hu Jintao's son.
Namibia's anti-corruption commission said it would like to question Hu Haifeng, but that he was not a suspect.
Hu Haifeng was president of the firm, Nuctech, until last year.
Nuctech is suspected of bribing a Namibian consultancy in connection with a $56m (£34m) deal to supply scanners to Namibia's ports and airports.
The co-owners of consultancy Teko Trading, Teckla Lameck and Kongo Mokaxwa, and Nuctech's Africa representative Yang Fan, were arrested last week and are still in custody.
Teko Trading is alleged to have received $13.2m from Nuctech.
The Chinese firm is a global leader in X-ray scanners and security devices.
Hu Haifeng, 38, was president of the firm until last year when he was promoted to a post with Tsinghua Holdings, the group that controls Nuctech and a number of other companies.