Abstract: In order to research the floating, friction and wetting characteristics of rape and study how they effect the rape cleaning performance, DFPF-25 floating speed instrument, umt-2 friction and wear tester and cam101 contact angle instrument were used to test the floating speed, multifrequency reciprocation friction factor and contact angle on rape excursion components. The results showed that similar floating speed of three rape excursion components lead to an unobvious effect of wind in the cleaning process; and friction factor changed periodically in multifrequency reciprocation condition and instantaneous friction factor of rape stem exceeded 1.0 while the maximum friction factor of rape husk was 0.2, which indicated that rape stems detached harder from cleaning sieve than rape husks. Rape stems surface were hydrophobic and lipophilic while rape husks surface were hydrophilic and lipophilic, which implied that oily ingredients contributed more to rape excursion than water. Therefore, developing low friction, hydrophobic and oleophobic cleaning sieve is the key of resolving the problem of rape excursion adhesion and jams on the sieve in the cleaning process.