Abstract: Thesurfacesamplingtechnologyisanimportantmethodforgettingsoilsample.Itisakeytechnologyforcollisionavoidancetrajectoryplanningwithcomplexlunarterrain,uncertainlandingattitudeandirregularlunarprobeenvelope.Accordingtothedesignoffourdegreeoffreedomsurfacesamplingdevice，kinematicsandinversekinematicswereanalyzed.Consideringtheconstraintsofdynamicandstaticobjectpoints,therestrictionspacewasdividedintoavailablecollisiondetectabilityareaandunreachableset.Toexpeditetheplanningspeed,thedynamicavailablecollisiondetectabilityareaandunreachablesetwereintroducedtotheartificialpotentialfieldmethod.Andthecollisionavoidanceplanningalgorithmwasproposed.Thesimulationresultprovesthatalgorithmiseffectiveforsurfacesamplingtrajectoryplanning，anditcanbeusedtosupportsurfacesamplingdesign.

Key words: Surfacesampling；Manipulator, fourdegreeoffreedom, Collisionavoidanceplanning, Artificialpotentialfieldmethod, Lunarexploration