Abstract：The rock friction-sliding features in condition of bi-axial loading are experimentally studied with gabbro and granodiorite as examples. The five important influence factors，that is，normal stress，rock property，roughness of the friction surface，aqueousness and sliding rate，are experimentally studied and analyzed. It is revealed that (1) the higher the normal stress is，the easier the stick-slip is and the longer the period is between two consecutive stick-slippings，(2) if the boundary conditions are the same，stick-slip potentiality of gabbro is bigger than that of granodiorite，(3) the roughness of the friction surface has much influence on the stick-slip property，and the repeated frictions will increase the instability of stick-slip，(4) the friction strength of aqueous rock is to decrease，but it will recover gradually with the heat production and the water evaporation in the process of friction-sliding，and (5) in condition of low friction rate，the rock friction-sliding is chiefly stick-slip，while in condition of high friction rate，the rock friction-sliding is chiefly stable slip.
