Fan/compressor is one of the key components of turbo jet engines.As higher performance is demanded by the engines with higher thrust/weight ratio

some new techniques appeared and were needed to be further studied.The development trend of fan/compressor is described.The main measures for improving performance

such as high blade speed

low aspect ratio

high through flow inlet stage

swept blade

splittered vane rotor

are discussed.Unsteady flow in fan/compressor not only affects its gasdynamic performance

but also reliability

since high cycle fatigue

stall and flutter will cause serious machine damage.CFD provides possibility of fast development of our fan/compressor techniques.Further researches are proposed in this paper.