Prosecutors in Shanghai have completed the indictment against him and plan to hand the case over shortly for trial, the group said.
Conviction generally carries a penalty of up to five years in prison.
Court and police officials in Shanghai said they did not know about the case. Lin's arrest in April highlights the government's determination to prevent use of the Internet as a tool to challenge Communist Party authority and strict control over information. Shanghai's Internet police division recently has been reinforced with 150 additional computer experts, the Hong Kong-based center said. Some Chinese Internet users have found their access blocked or even had their computers confiscated by police, the center said. The publishers of Tunnel, a weekly online magazine featuring dissident writings, were arrested in central Jiangxi province Monday, according to the U.S.-based Chinese Democratic Party.