Longlin Temple Tunnel is one of the 26 risk II tunnels on Yichang-Wanzhou Railway. The whole tunnel locates in limestone strata, and the standard height of the whole tunnel is through a vertical seepage zone. In construction process, several large caverns were revealed, whose karst and development characteristics were introduced, and the processing methods of two super-large karsts were discussed. DK232+467 is the biggest cavern in the construction history of China railways, and cavern protection and construction are extremely difficult. Subgrade filling and opencut tunnel were adopted. The large span roof of DK231+796 cavern is very difficult to process and its construction risk is high. Supporting columns were creatively used to support cavern roof. The successfully processing experience of the two super-large caverns will provide reference for similar projects.