Objective To analyze the volumetric measurement of post⁃stroke hemiplegic edematous hands using 3⁃D scanning and water displacement. Methods Hand volumes of 100 post⁃stroke hemiplegic patients were measured using a non⁃invasive 3⁃D scanner. We defined the hand mark as the line between the ulnar styloid and the radius styloid，then 3⁃D forms of the hands were captured by the 3⁃D scanning system. Traditional water displacement was used for volumetric measurement as well. Statistical analysis was applied to compare the hand volumetric results between the two measurement methods. Results There was no significant difference between two methods of hand volume measurement（asymptomatic hand：t = 1.378，P = 0.171；edematous hand：t = 1.973， P = 0.051）. A significantly strong positive correlation was observed between the asymptomatic hand（r = 0.992， P < 0.001）and edematous hand volume（r = 0.997，P < 0.001）calculated via 3⁃D scanning and water displacement. The Bland⁃Altman analysis showed that the two measuring volume methods were within the 95% consistency limits of agreement（LOA）. Conclusion The contactless three⁃dimension scanning method has the same effect in mea⁃ suring post⁃stroke edematous hand volumes when compared with the traditional method of water displacement. It can be used toconduct an accurate volumetric analysis of an edematous hand and provide reference for future research on the recovery of hand edema.