According to the requirement of studying for engineering mechanical properties of rock material

a loading apparatus for meso-mechanical experiment of rocks has been developed . The appratus can be used as an additional instrument for optical solid microscope

and with the microscope

the complete failure progress of the four faces of rock samples ( rectangular in shape)under loading can be observed. In this way

the stress-strain curve and the related graphic of the changing microstructure of rock smaples can also be attained.