The 57-year-old widower made the promise at his engagement banquet on Wednesday sitting beside his bride-to-be, 33-year-old dancer Delia Tseng, said reports.

His Hon Hai Group's flagship company, Hon Hai Precision Industry, is the world's largest contract manufacturer in the electronics sector for brand-name companies such as Dell, Nokia and Sony.

Mr Gou said he had signed papers to pledge away his fortune before he decided to marry his fiancee, said reports quoting a lawmaker at the banquet.

But with Mr Gou's remarriage, she had to sign the documents too for his pledge to take effect.

He said he was moved when she signed the papers without hesitation.

'Mr Gou made the decision to donate 90 per cent of his personal assets to charities in the future and his bride-to-be supports the decision without any hesitation,' lawmaker Wu Den-yih told TVBS news channel.

Mr Wu, who is also secretary-general of the ruling Kuomintang, was a guest at the banquet at the Grand Hyatt hotel. So were President Ma Ying-jeou and his wife.

Mr Gou's first wife died of breast cancer in 2005. They have two children.

He was linked to actress Lau in late 2006 and early last year. Lau, who said she did not fall in love with the tycoon, married actor Tony Leung Chiu Wai in Bhutan on Monday - while wearing a reported 12-carat diamond ring.

Mr Gou met Ms Tseng last year when she was asked to teach him and model Chiling Lin the tango for a dinner and dance.

The billionaire, who built his empire from scratch, has said of his fiancee: 'I don't smell money on her.'

Apple Daily said she was wearing a three-carat diamond ring at the engagement banquet.

The newspaper estimates Mr Gou has donated nearly NT$20 billion in recent years, including NT$270 million to China for relief work following the devastating Sichuan earthquake in May.

AFP