最後經由Xplor-nih計算軟體算出得知結構，hNPY[21-31]在285K的狀態下產生螺旋結構的序列在23-29；310K之下則為24-29。經由模擬焠熄實驗之後得到的結果加以堆疊出285K、310K主幹RMSD分別為0.86、1.89。 A part of conformation of human Neuropeptide Y (hNPY) in solution is α-helix. It''s monomer in low concentration (nM) and dimer in high concentration (mM). It has to binding with cell membrane in monomer and diffuse to receptor before binding with receptor. hNPY[21-31] was synthesizd by solid phase peptide synthesis (SPPS ) and purified by HPLC. We checked the molecular weight of peptide by ESI-MASS. We used 2-D NMR and got chemical shifts and NMR restraints by TOCSY, NOESY and HSQC. By DOSY and calculation of diffusion coefficients, we found that there were dimmer in part of hNPY[21-31]. Finally, we got structures by XPLOR-NIH and found that there were resides 23-29 to form helix in 285K and resides 24-29 to form in 310K. RMSD were 0.86 in 285K and 1.89 in 310K by calculating molecular-dynamics refinements.