Disclosed herein is the methods that humanized anti-LGR5 antibody is used for treating cancer. Antibody as described herein does not interrupt LGR5-RSPO1 bindings or signaling in combination with LGR5, and may destroy LGR5 signalings and be independently of RSPO1 by wingless protein. This also disclosed in heavy chain and light chain polypeptide sequence faces LGR5, for example, without destroying LGR5-RSPO bindings or signaling.