We used the solution of HAuCl4 and Na3 C6 H5 O7 to prepare the gold nanoparticles. The different shape and sizes of gold nanoparticles depends on the different amount of solution. We used gold nanoparticles with 35nm diameter to do experiments. Put the colloidal gold on a aluminum plate, copper plate and plastics plate, after dried, several items of tests had been done. we could see the mechanical property of gold nanoparticles such as hardness, extend rate was changed a lot than the common gold material. The reason was that the metallographic organization of gold nano materials was much tiny than common gold materia.

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