A Chinese mainland spokesperson on Wednesday said the trade barrier investigation into Taiwan's trade restrictive measures against the mainland is completely justified and reasonable.

Taiwan authorities have long adopted unilateral restrictions on a large number of product items from the mainland and this is a fact, Zhu Fenglian, a spokesperson for the Taiwan Affairs Office of the State Council, told a press conference.

Zhu said the mainland launched the trade barrier investigation as the trade restrictions placed by Taiwan authorities have damaged the interests of relevant industries and companies on the mainland, as well as the interests of consumers in Taiwan.

The Ministry of Commerce carried out the investigation in accordance with the non-discrimination principle of the World Trade Organization and relevant regulations of the mainland, which is completely justified and reasonable, the spokesperson said.

Having fair trade in the principle of non-discrimination will further boost the sound development of trade across the Strait, said Zhu, adding that it will allow the industries and companies on both sides of the Strait to better complement each other's strengths and promote common development.