In this paper,a high resolution portable Raman spectrometer based on asymmetric cross Czerny-Turner (C-T) optical structure and TE cooled linear CCD is designed an d optimized.The C-T structure is typically used in the monochromator with a curved image plane,whi ch does not match the detector surface of the CCD.In order to achieve both high resolution and high sensitivity,the main optical aberrations are analyzed,and then a design metho d for coma and astigmatism correction is presented.Tracepro is used to simulate the aberrati ons before and after optimization,which significantly shows the changes of the overall spectrum resolution and sensitivity.With a laser diode (785nm),the portable Raman spectrometer is app lied in drug and jade identification with satisfactory results,and has the spectral range of 200－2700cm－1,the spectral resolution (FWHM) of 6－8cm－1,and the s ignal-to-noise ratio of 300∶1.