摘要：The objective of the present paper is to study the sweep effect on the blade design performance of a transonic compressor *** baseline to be modified and swept is a designed well efficient transonic single rotor compressor. The first part of the present study is concerning the sweep effect with straight leading *** this case fixing the hub section the swept blade is formed by tilting the leading edge with whole blade forwards and backwards *** second part is to use an optimization strategy with simple gradient-based optimum-searching method and multi-section blade parameterization technique to search and generate an optimal swept rotor with curved arbitrary leading *** adiabatic efficiency is a little bit greater than that of the reference un-swept rotor.