He was the Minister of the Mainland Affairs Council (MAC) of the Executive Yuan since 28 September 2012 until 16 February 2015,[3] when he resigned over the dropping of espionage charges brought against Chang Hsien-yao.

[4] Wang is the first ROC ministerial-level government official to visit mainland China after the end of the Chinese Civil War in 1949.

As a member of the NTU team, Wang argued persuasively against his group opponent from Nanjing University, saying that "mankind co-existing in peace is an impossible ideal".

[6] After the issuance of new version of PRC passport in May 2012 which features Taiwan's iconic landmark of Sun Moon Lake and Chingshui Cliff along with China's iconic landmarks of Tiananmen Square and the Great Wall of China, Wang told the Strait Exchange Foundation had written to Association for Relations Across the Taiwan Straits in December 2012 to explain the matter, telling that this incident could harm the good development of cross-strait relations.

[19] In October 2013, in a hotel lobby on the sidelines of the APEC Indonesia 2013 meetings in the Indonesian island of Bali, Wang met with Zhang Zhijun, a ground breaking historical meeting for the first time between leader of Taiwan Affairs Office and leader of Mainland Affairs Council, where the two addressed each other by each's official title.

Both of them called on the establishment of a regular dialogue mechanism between their two agencies to enhance mutual understanding and facilitate cross-strait engagement.

[22] President Ma Ying-jeou, through Presidential Office speaker, expressed his gratification, reiterating that the two sides do not deny each other's authority to govern.

[26][27] During the meeting, Wang and Zhang agreed on establishing a direct and regular communication channel between the two sides for future engagement under the 1992 Consensus.

[33] Commenting on the initiative of constitutions with different interpretations (憲法各表) for cross-strait relations between the Democratic Progressive Party (DPP) and the Chinese Communist Party put forth by former Chairman of the DPP Frank Hsiehin mid April 2013, Wang explained that the initiative entails state-to-state relations and will not accepted by Beijing.

[34] In early May 2013, Wang made a statement that if the PRC is willing to remove all of the missiles pointing at Taiwan voluntarily, it would be a gesture of goodwill which Beijing could show to Taipei, because it doesn't need cross-strait negotiation to carry out, only willingness on the part of mainland China.

He added also that he wished to see exchange visits by leaders from both sides of the Taiwan Strait and in which both parties address each other using their formal official capacity.

[35] In mid June 2013, Wang stressed the ROC government stance that the One-China policy they have been embracing is the Republic of China.