The compressive property of a single basalt fiber in basalt/epoxy and basalt/PCBT composite was investigated by nano-indentation with the application of conical-pyramidal Berkovich tip. The nano-indentation test involved a load from 30 mn to 200 mn. Every indent was produced on section of a single fiber. Area function was selected according to the depth of the indent. The results showed that compressive modulus and hardness of basalt fiber is higher than those of glass fiber and carbon fiber in the same matrix. The modulus of basalt fiber behave differently when embed in different matrixes.
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