Objective       To study the method of laser and acid treatment of titanium implant to produce nanotubes on the surface.        Methods       The titanium surface was treated with laser

acid etching (18% HCl and 49% H

2

SO

4

) and anodic oxidation. Surface morphology was tested with scanning electron microscopy (SEM). Elemental composition and compound states were tested with electron probe microanalysis (EPMA). Surface roughness was tested with a BMT Experi 3D surface topography instrument.        Results       The surface of titanium implant had composite microstructure and nanostructure (nanotubes)

element composition of Ti and O

anatase crystal ph

ase

and surface roughness of Ra=8.19±0.09 μm

Rq=10.64±2.10 μm

and Rt=43.42±6.18 μm.        Conclusion       The surface treatment method of titanium implant with laser

acid etching (18% HCl and 49% H

2

SO

4

) and anodic oxidation generates rough surface with nanostructure and good physical properties.