The current distributions of three endangered mangrove species Lumnitzera littorea(Jack.) Voigt,Hernandia nymphiifolia (Presl) Kubitzki and Pemphis acidula J R & G Forst in China were investigated in east coast of Hainan Island.There were nine trees of L. Uttorea in the Tielu Bay Sanya,and they were in the old or near old growth forest stage.Only 38 trees distributed in the Lingshui Village, which were severely damaged.L.littorea in the two places could bloom normally,but there were no seedlings.Totally 223 H. nymphiifolia trees distributed naturally in the Qionghai Boao and Tanmen.Five trees naturally distributed in the Wenchang,and four trees were artificially grown in the Dongzhaigang.They could not fruit but flower in these places.There were totally 23 trees of P. acidula in the Huiwen Wenchang,and they could flower and fruit.The seeds could germinate,but were difficult to grow.The results are useful in making appropriate protection and restoration measures.