Abstract: 1'he effect of different hardness and surface finish of the friction sur-
face of drilling pump on its friction—wear property under abrasive wear
is mainly dealt with in this paper with the purpose of finding out the
optimum match for the friction surface with proper hardness and surface
finish according to technical and economic considerations.Fight tests for
the testing rings，;which are made of high—chromium cast iron with differ-
cnt hardness and surface finish，rubbing against the testing blocks，which
are made of Perbunan Rubber with different hardness，are carried out on
MLD—10 dynamic abrasive machine.More than 500 data are obtained，and
a nuwbex of interesting phenomena are also discovered.On the basis of
-tlisr the—gararneters for. designing liners and piskpns are pre-seteH in thus paper.