On May 9, 2002, Li Junjie was placed on file for investigation by the Henan Provincial Procuratorate. Later, Huang Yonghao was also investigated. The CPC Central Commission for Discipline Inspection has never stopped investigating Gao Yan's case. In the process of putting the case on file, he traced the problems of Li and Huang, and CPC Central Commission for Discipline Inspection informed the Henan Provincial Procuratorate and was investigated. Later, Huang Yonghao was taken away by the procuratorate.

In March 2004, in the internal report made by the power system discipline inspection department, Gao Yan, the former general manager of Guodian, was characterized as "betraying the party and the country, leading a corrupt life, embezzling huge amounts of state property, and being directly responsible for the massive loss of state assets." On June 26th, 2004, Li Junjie, a deputy director-level cadre and former deputy general manager of Henan Electric Power Company, was in Zhengzhou Detention Center, waiting for the upcoming judgment. Huang Yonghao, the former deputy general manager of the provincial electric power company whose office is next door, was also investigated by the Anti-Corruption Bureau of Anyang City Procuratorate in Anyang City, Henan Province, hundreds of miles away.