We investigate the lasing action of the nematic liquid crystal device,which is added laser dye DCM and chiral compound CB15. The anti-parallel rubbing device is manufactured and the planar texture state of cholesteric liquid crystal is achieved. The emission spectra is mesured and anylazed using a frequency-doubled Nd:YAG pulsed laser (λ=532 nm) as pumping source. Broad fluorescence radiation spectra of DCM is observed under lower pumping energy. When pumping energy is larger than 18.0 mJ,dramatic narrowing spectra which has the obvious threshold and the direction characteristics is observed with centre wavelength of 606 nm. The full width at half maximum (FWHM) is about 10 nm.