This paper describes the characteristics of laser dye DPDO series which are new compounds of the 2, 6-di(p-, -m-, or o- substituted phenyl) -benzo -bisoxazols. Typical absorption spectra and fluorescence spectra of DPDO are given, and the tuning curves of dye laser with such compounds excited by N2 laser are measured. It is found that the DPDO series are working in the spectral region of 371 to 394 nm and having the conversion efficiency approximately double to that of BPBD. The DPDO series also have good pliotoohemioal stability. The outpui of dye laser does not decrease aftsr eight Jiour3 nitrogen laser excitation at 200 kW paak power and 5Hz repetition rate. The dye solution can be used at intervals and preserved for 2~3 years but yet maintains its performance. The series of DPDO can be divided into two types according to their structures. Typs I with symmetric center structure lias higher conversion efficiency buij more “red” peak wavelength than type II which has not a symmetric center.