There was water seepage and frost boiling in the track plate at the local uplink of the ballastless track of Baicaoan Tunnel of the Tangbao railway line. Under dynamic loading of trains， the track plate sank unevenly. Railway track plate sinking was treated by grouting and glue injection： The 0.5m vertical depth of the broken rock layer under the inverted arch of the suspended track plate was injected with quick-setting cement slurry to achieve compaction and solidification of the broken rock layer at the bottom of the arch to improve and increase the rock bearing capacity of the base of the inverted arch； and a new 4.75^# high-strength foamed resin was injected into the bottom of the sinking track plate to lift the whole track plate until it returns to its original position. After grouting and glue injection， the vertical subsidence of the line has reached the designed stable value with the carrying capacity of the ballastless track restored.