A LEADING mainland dissident has defied a ban on talking to foreign journalists and publishing articles, according to his friend Lau Shan-ching. Wang Xizhe, who was freed early this year after 12 years in jail for his role in the 1979 Democracy Wall movement, said he would rather go back to prison if he was not given personal freedom. Mr Lau, a Hongkong dissident, was released last December after serving a 10 years in prison for convictions on ''counter-revolutionary'' charges in Guangdong. He said in Hongkong yesterday that Mr Wang had recently been asked by the Chinese authorities not to give interviews to foreign journalists, publish articles or do business on the mainland. Mr Wang rejected the restrictions imposed by Public Security Bureau in Guangzhou saying they were unreasonable. He had threatened to petition against the Beijing Government. Mr Lau said: ''He was later allowed to do business in Guangzhou. He was told that he was still on parole and could not leave Guangzhou to do business elsewhere.'' Mr Wang said he planned to find a foreign partner to open a children's bookshop in Guangzhou. He has also decided to go ahead with his plan to write a memoir on his days in Guangdong prison, despite the ban. Mr Wang, 45, was accused of ''counter-revolutionary incitement, organising and participating in subversive groups and rebellion against the Government''.