[Objectives]  To investigate the correlation between the wing shape and flight capacity of Sphingid moths, the larvae of which are important agricultural or forestry pests. [Methods]  The flight capacity of 8 Sphingid species; Psilogramma increta, Parum colligata, Kentrochrysalis sieversi, Ambulyx ochracea, Callambulyx tatarinovi, Acosmeryx naga, Ampelophaga rubiginosa and Theretra japonica, were investigated in a 26-channel flight-mill system over 10 hours in a complete darkness at a temperature of 25 ℃ and relative humidity of 70%. Three flight parameters; total flight distance (TFDi), total flight duration (TFDu), average flight speed (AFS) and 6 wing form parameters; forewing length (FL), forewing width (FW), forewing area (FA), hindwing length (HL), hindwing width (HW) and hindwing area (HA), were measured and compared. [Results]  P. colligata was the strongest flier with a TFDi of 4 450.88 m and a TFDu of 3 629.55 s; the highest values of these parameters among the 8 species. A. rubiginosa had the weakest flight capacity with TFDi and TFDu values of  1 116.48 m and 1 156.85 s, respectively. The fastest flier was A. naga with an AFS of 1.35 m/s whereas P. increta was the slowest was with an AFS of 0.63 m/s. P. increta had the highest values in all 6 wing form parameters whereas T. japonica had the smallest values in 4 wing-form parameters (FW, FA, HW and HA). C. tatarinovi and A. ochracea had the smallest FL and HL values, respectively. Using stepwise regression, the multivariate equation for total flight distance with 4 wing form parameters was y =﹣12 610.8﹣724.50x₁ + 2 619.51x₂ + 1 090.7x₄﹣96.23x₆ (R²=0.998 0，F=383.765，P=0.000 2，where x₁、x₂、x₄、and x₆, are FL, FW, HL and HA, respectively). [Conclusion]  The total flight distance of hawk moths can be predicted from some of their wing form parameters.