For study of phycoerythrin(PE), We selected a strain algae (Rhodosorus marinus) which is significant and has not been reported before by means of culture of four strains of algae and comparison of their spectral character. The method for separating and purifying PE was improved. Three PE(b-PE, B-PE_1, B-PF_2) from R. m were purified with DEAD-52 cellulose column and Bio-gel P300 column by four times. The three PE were purified to electrophoresis purity. (A_(545nm)/A_(280nm) > 4.0). On a calibrated Sephadex G-200 column a molecular weight of 42KD was found for b-PE, a molecular weight of 330KD for P-PE_1 and a molecular weight of 280KD for B-PE_2. The SDS-PAGE indicated the subunit structure of the three PE was: (αβ) for b-PE; (α'_2β')_6γ' for B-PE_1 and (α"_2β")_6γ" for B-PE_2. The absorption spectra and the fluorescence spectra of the three PE were determined. The absorption spectra and the fluorescence spectra of the three PE were determined. The absence of presence of an absorption peak (or shoulder) at 498nm represents the major difference between the b-PE and B-PE. The difference is correlated with the present of one of subunit. The amino acid composition from the three PE are relatively rich in aliphatic and acidic amino acid. That is the reason why the isoelectric point of the three PE tends to acidity. The PE from R.m is stable from PH4.5-8.0, and thermostable up to 60 ℃ and it exhibits poor light stability especially to ultraviolet light. The PE were protect from the photo-oxydration by the means of mixing with some reductant. We obtained one PE which is resistant to alcohol.