Response of compressor to the inlet combined distortions of pressure and temperature is emphasized in this paper.The mathematic model used in the paper is based on the one dimensional and time dependant Eulerian equations

taking into account of the work applied by compressor system

air bleeding and heating processes.The inlet-outlet assumptions of parallel compressor theory are modified

and the effect of three circumferential combined distortion modes of the compressor is calculated.The changes in compressor stability boundary under distortion conditions are given.According to the calculated results

it could be concluded that among the three combined distortion modes discussed in this paper

if total temperature and total pressure are in the same area

the compressor's stability margin descends to the utmost;if they are in separated areas

the stability boundary descends least;if the areas are partially overlapped

the boundary decreasing amplitudes lie between the former two cases

and this condition also exhibits some of their characteristics.