Ji Zhongxing, who has been sentenced to six years in prison for setting off a blast at a Beijing airport, filed a lawsuit against Guangdong Public Security Department on Monday in protest at the department's refusal to present background evidence at his trial.

Ji had requested the department to present police findings relating to an attack that left him paralyzed in 2005, and which he claims is the root cause of troubles with the authorities, Beijing Times reported.

Ji, 34, set off a small blast at Beijing Capital International Airport in July in protest at his failure to win justice and compensation after he was seriously beaten by two security guards in Guangdong eight years ago.

In his appeal, Ji said he was not satisfied with an administrative ruling by an intermediate court in Guangzhou, the capital of Guangdong province, which turned down his petitions to have police findings entered as evidence.

Police authorities in Dongguan, Guangdong province, where Ji had worked as a motorcycle taxi driver since 1999, had records of the incident on file, according to Ji's lawyer, Liu Xiaoyuan.