Purpose The structure of fiber tufts made by nipping a sliver composed of staples of an equal length has been analyzed with the following results:(1) The fiber distribution in a sliver can be practically evaluated by using the value of V{(WF; -WR; )/√ } where Wr; : weight of the front tuft WR; : weight of the rear tuft V: the variance(2) The degree of fiber hooking in a sliver can be accurately measured by E{(WF; -WR; )/(WF; +WR; )} where E: the mean(3) The short fiber content R in a staple diagram has a close correlation to RI; and RII; obtained by the fiber tuft method, as shown in the formulas R=12RI; /(3+4RI; ), R=3Rno-issue=869-870II;