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Phosphorylated polysaccharide PLEP-1a, with the PO43− content of 6.39%, was prepared from LEP-1a by phosphorylation. IR, 13C NMR and 31P NMR results of PLEP-1a showed that the original basic structure of the polysaccharide was not changed, and the H2PO3 group was linked at C6 of LEP-1a. The results of anti-tumor experiments in vivo showed that 100mg/kg and 400mg/kg of LEP-1a could significantly improve...