Abstract: We collected 837 soil and water samples from the coastal beaches and wetlands ofthirteen provincesand autonomous regions, 827 Trichoderma stains among which were isolated. Experimental results show that Trichoderma is more easily isolated from soil samples than from water samples. Moreover, lower salt content in soil samples is more easy for Trichoderma isolation.Altitude is another vital factor influencing Trichoderma distribution.Isolation rate of Trichodermais the highest when its altitude ranges from 100 m to 1 200 m. This may attribute to the rich vegetation at such altitudes.

Key words: coastal beach and wetland, isolation rate, Trichoderma, soil sample, water sample