In Liuyangbao Gas Field， lost return leakage generally occurs in the horizontal well during running casing through the horizontal section. This is mainly reflected in the fact that drilling slurry will not return out of the well when casing is set from 2800 to 3100m， though staged circulation is adopted. In the field， casing was directly run to the bottom of the well， and then the normal injection and reverse squeeze displacement method was used to establish circulation to ensure normal cementing. The method has solved effectively the problem of lost circulation in casing cementing， and provides solution for the similar situation in other blocks．