[Objective] To analyze the soil condensation water in three plant communities in Hulunbeier grassland in order to provide basis for the effective utilization of water resource in restoration of grassland vegetation in desertified land.[Methods] Three plant communities

Artemisia capillaris

Cleistogenes squarrosa and Leymus chinensis were selected to measure the formation time and amount of soil condensation water as well as their dynamic changes by weighing method and the effects of vegetation type

and environmental factors were analyzed on the formation of soil condensation water.[Results] (1) The soil condensation water began to form 18:00 and began to evaporate after 6:00. Soil condensation water dynamic changes showed bimodal pattern

one of the first peak appeared at about 20:00 while the second peak appeared at about 4:00; (2) Soil condensation water amount in different plant communities showed significant differences(p<0.05). From July to September

the daily mean amount of condensation water in the three plots

A. capillaries

C. squarrosa and L. chinensis

was 0.28 mm

0.22 mm and 0.32 mm

respectively in July

0.50 mm

0.35 mm and 0.69 mm in August

and 0.28 mm

0.23 mm and 0.37 mm in September; (3) Soil condensation water in different depth of soil follows as an order as 0-5 cm > 20-25 cm > 5-10 cm > 10-15 cm > 15-20 cm

the amount of condensation water in 0-5 cm layer in L. chinensis plot was up to 0.147 mm

followed by the A. capillaries plot(0.125mm) and C. squarrosa plot(0.094mm).[Conclusion] There was two sources of soil condensation water. Different types of plant communities resulte in the different contributions of these two sources to the total amount of soil condensation water. L. chinensis can form more soil condensation water

which may play a more important role in restoration of grassland.