Biological soil crusts (biocrusts), including the microscopic (algae, cyanobacteria, bacteria, and fungi) and macroscopic (lichen, moss, and microarthropod) organisms, are a common and wide-spread feature of arid and semiarid landscapes throughout the world. They are considered to be essential components of healthy desert ecosystems, of which succession goes mainly from no crust stage (NCS) to algal crust stage (ACS), lichen crust stage (LCS), and moss crust stage (MCS). In order to ascertain how biocrusts influence settlement of seeds drifting easily in arid desert region, the seed dispersal process of Reaumuria soongorica, surface features of some microsites in fixed quadrats deployed on the NCS, ACS, LCS and MCS at the southern edge of Badain Jaran Desert, and relationships of persistence seeds to the above microsites were studied with the method of artificial supplying seeds and long-term monitoring. The results showed that:(1) in comparison with the NCS, the area percentages of litter, micro pit, crack and moss distributing on the dunes changed significantly during the development from ACS to MCS, where the litter showed a trend of increasing (ACS)-stabilizing (LCS)-decreasing (MCS), the pit and crack firstly increased and then decreased (their peak values were at LCS), and long moss increased continuously. (2) A significant difference in the loss speed or settlement rate of R. soongorica seeds on the above quadrats of NCS, ACS, LCS and MCS was observed, in which the loss speed and settlement rate declined in the orders of NCS > ACS > MCS > LCS and LCS > MCS >ACS > NCS, respectively. (3) It was found that seeds settled on the biocrustst only existed in litter, micro pit, crack and long moss; Meanwhile, there was a significantly positive correlation between the number of settled seeds on the four microsites and their area, and their relationships might be expressed by the formula of y=ax²+bx+c (a ≠ 0). Moreover, an obvious difference in the settled seeds on the litter, micro pit, crack and long moss under unit area condition was surveyed, and the seed quantity settled on crack was about 2.5, 12.5 and 18.0 times as big as that of litter, micro pit and long moss, respectively. Therefore, it was considered that the influences of biocrusts on seed settlement of R. soongorica mainly caused by area changes of some microsites possessing strong abilities to capture seed under unit area condition.