Hi, all. This problem has been solved. The reason is I used the NOAH-MP LSM which WRF get LAI from table, that is the MPTABLE.TBL.
In the file MPTABLE.TBL, LAI=0 when landuse classifications are “Deciduous Needleleaf Forest”, “Croplands”, “Urban and Built-Up”, “Snow and Ice”, "Barren or Sparsely Vegetated, “Water”, and “Barren Tundra”. As my simulation time is March and domain is north of China where have large area of desert, so many LAI=0. And I changed the LSM to NOAH, this problem gone away because grids where landuse classifications are "Barren or Sparsely Vegetated, “Barren Tundra” were assigned a value of 0.01 in the WRF.
Finally, thank you for your help @rgilliam
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