A PROMINENT Chinese academic has won the right to continue his research in Britain after a campaign on his behalf in the UK and Hong Kong convinced the British Government to reverse its decision to expel him. Dr Xu Liquin, a computer scientist regarded as one of the world's leading authorities on artificial intelligence, has now taken up a post at the University of Abertay in Dundee where colleagues are delighted at the change of heart by the Government. At his new post in the Scottish city yesterday, Dr Xu said: ''I am grateful to all my friends and for the support I received in the media. ''I just wanted to continue my work and career and did not want to be interrupted and kicked out of the country.'' When the Department of Employment refused to renew his work permit, forcing the Home Office to issue an expulsion order, letters backing Dr Xu flooded in. Dr J. E. Sanderson of the Department of Medicine at the Chinese University of Hong Kong wrote to Prime Minister John Major protesting against the attempt to remove him from the country. The Department of Employment wrote back to him saying that in the light of further information about Dr Xu's work received from the university his case had been reconsidered. Another academic who campaigned on his behalf, Graham Tattersall of the University of East Anglia, said: ''I am glad that they changed their minds. It is a sensible decision.'' Dr Xu, 32, who is married, came from China in 1990 after being awarded a Royal Society/British Telecom research fellowship at the University of East Anglia. He has since worked at the University of Sussex and King's College, London.