The ostrich is the fastest biped animal in the existing creature.On the sand environment,ostriches can run with an spectacular speed and endurance.The ostrich plantar surface,as the sole part to contact sand,provides the whole forward forces for its heavy body,which need the curved surface structures and unique papillae covers to provide an enough large adhesive forces.In this article,we tried to measure this forces between the plantar surface and five different substrates,namely the solid ground,the single-deck sand,10mm thick sand,20mm thick sand and 30mm thick sand under 4 different normal load.In order to explore how the grain size to affect the adhesive forces,we used sand with different diameters,the diameters were 1-2mm,2-4mm and 4-6mm respectively.The experiments were done on the self-designed trial platform.We used the quickdrying concrete to fix the ostrich foot and thermoplastic to fix a particular toe posture.Data indicated that the maximal adhesion coefficient were from the interaction between the plantar surface and the single-deck sand.The minimum were from the interaction between the plantar surface and the solid ground.The adhesion coefficient increased with the grain size of the sand.We found that the normal load did not influence the adhesion coefficient observably.Those conclusions can contribute to the exploitation of ostrich high speed locomotion on sand and provide a reference for bio-inspired design.