This invention relates to similar compound of glucagon-like peptide 1(glucagon-like peptide-1, GLP-1) secreted by insulinotropic hormone, i.e. shortened glucagon-like peptide 1(sGLP-1) consisting of 26 amino acids. Its sequence is as follows: His-X1-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-Ser-Tyr-Leu-Glu-Gly-Gln-Ala-Ala-Lys-Glu-Phe-Ile-Ala-Trp-Leu. In comparison with the present GLP-1 and its similar compound, the shortened glucagon-like peptide 1(sGLP-1) in this invention has the following prominent advantages: 1. After reconstruction, the shortened peptide chain has stronger simulation to islet cell captors and stronger insulin secretion stimulation action； 2. the reconstructed simulation sequence can resist dipeptidyl peptidase decomposition by change of the second amino acid sequence from Ala to Gly or Ser to prolong its half time and enhance drug action； 3. To shorten the peptide chain leads to reduced synthesis cost.
