| In this paper, we observed and compared the characteristics of phenophases, fruit-set patterns and burial mode of subterranean dispersal units, growth dynamics and the biomass allocations strategy in Ceratocarpus arenarius L.. The main results were as follows:(1) The characteristic of phenophases, fruit-set patterns and burial mode of subterranean dispersal units: It was early of seed germination and flowering. Vegetative growth and reproductive growth had a longer concomitance which took more than four-fifths of life-circle. The subterranean dispersal units, only two, sitted on the first node of the main stem, and aerial dispersal units on the spherical plant forming by pseudtrifurcate branch. The flower of coming into being subterranean dispersal units was specific. It was successful to bury subterranean dispersal units by combiningactive mode of dynamic"reversing"with passive mode by means of soil and sand brought by wind and rain.(2)The growth dynamics and the biomass allocations strategy: The growth speed of plant height showed a pattern of"increseing-decreasing-increasing",while that of root length was decreaseing gradually. This rule have a close correlation with the soil water contents in different life-history stages. Reproductive allocation is more than 47 %,and it's higher than that of monocarpic herbaceous plants.(3)The characteristic of fruits dispersal: Subterranean fruits were not easy to disperse and germinated in situ. Aerial fruits dispersed for a long distance by wind and animals, and dispersed with tumbleweeds by wind for longer distance. The fruits dispersed from September, and mostly in October and November. The number of dispersal fruits decreased as well as increased rolling distance in simulation experiment. There were highly significant negative correlation bewteen the number and the distance.
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