The application relates to the field of biological medicines and provides a GLP-1, GIP and GCG
receptor triple
agonist and application thereof, and relates to
a peptide compound with formula (I) or a pharmaceutically acceptable salt or solvate thereof, wherein X1X2X3 is H-Aib-H, Y-Aib-Q or Y-Ac3c-Q; X17 is Q or K; X18X19 is YA, YQ or AQ; X20 is Aib or Ac3c; X21 is A, D, E or R; X23 is V or I; X24X25 is NW, QR, EY, RY, RH or RW; X28 is E, R or A; X40 is K or is not present; and the C-terminal
amino acid is optionally amidated into a C-terminal primary
amide. The
peptide compound has the effects of reducing weight and controlling
blood sugar.