Research Conclusions: From the analyses of this extremely large water bursting, it can be seen it is suitable for draining the water in dissolved chamber connecting with underground river, but not for blocking it. Sluice culvert can be used if the water is large. It is proposed the sluice culvert of about 400m can be excavated at the outside of the tunnel, which has the same effects as Mengping Underground River. In this way, there is no bad influence on environment and the water height can be lowered, which can guarantee safe construction of tunnel and eliminate the latent danger. It is also proposed cap of pile trestle can be used for the dissolved chamber crossing tunnel with plate arch because the rocks around the chamber are complete with good stability and width of 11m.