Antitumor-analgesic peptide is a novel recombinant polypeptide with strong analgesic and antitumor effects.Antitumor-analgesic peptide inhibited the writhing response in a dose-dependent manner in a pharmacodynamic study, and the inhibitory rates of treatment using 1.0 mg/kg and 2.0 mg/kg antitumor-analgesic peptide were 25.5% and 69.8%, respectively.The analgesic mechanisms of Scorpion analgesic polypeptide are unknown.