Abstract: To understand the fundamental physical properties of lotus fiber and provide the theoretical basis for developing lotus fiber fabric,this paper tested the fundamental physical properties of lotus fiber such as density,linear density and moisture regain.The results show that the density of lotus fiber is(1.184 8) g/cm~3,much less than that of cotton,ramie and wool fibers,but similar to that of silk and acrylic.The linear density of lotus fiber is 1.55 dtex,finer than ramie and silk fibers,and similar to cotton and cotton type chemical fibers.It indicates that the lotus fiber is very fine and is beneficial to resultant yarn strength and yarn evenness.It can spin high count yarns.The moisture regain of lotus fiber is 12.32%,larger than that of cotton and silk,and less than that of wool and viscose,but similar to that of ramie fiber.It shows that the lotus fiber has very good absorbent quality.