Microbial induced calcite precipitation（MICP） technology is applied to the formation of in-situ bio-mineralization crust on the surface of desert

which enables floating dune to be semi-fixed and fixed

hinders wind erosion

and fundamentally blocks the source of sandstorm. Two bio-mineralization test plots（TP1 and TP3） were built using two different microbial strains on the Aeolian sand sur

face in Ulan Buh desert

Inner Mongolia Autonomous Region of China. The field-scale experiment methods and processes were designed to evaluate and analyze the strength of bio-mineralization crust and its long-term stability in the desert environment. Staphylococcus

extracted from local Aeolian sand

and Sporoscarcina pasteurii

a traditional bio-mineralized bacterium

were used to induce the formation of calcium carbonate crystals. Through penetration tests in site

the penetration resistance developed along the depth of bio-mineralization crust was recorded on the 7

th

14

th

28

th

60

th

and 210 th day. The strength of bio-mineralization crust was converted according to the value of average penetration resistance at 2.0 cm of the crust. The variation of strength of bio-mineralization crust with mineralization time was summarized. From visual observation in site

the bio-mineralization crust began to form on the 4

th

day. The average thickness ranges from 2.0 cm to 2.5 cm on the 7

th

day

and the strength of bio-mineralization crust induced from Staphylococcus was 1.05 times than that of Sporoscarcina pasteurii. For the bio-mineralization crust TP3 induced from Sporoscarcina pasteurii after freeze-thaw cycles on the 210 th day

the average thickness decreased from 0.7 cm to 1.0 cm

the strength was reduced by 19% and the content of calcium carbonate was reduced by 15%-30% compared with that on the 7

th

day. However

the strength of bio-mineralization crust TP1 induced from Staphylococcus on the 210

th

day was reduced only by 2%

which is a little less than that on the 7

th

day. MICP technology can be applied to the formation of in situ bio-mineralization crust in desert. The bio-mineralization crust developed from Staphylococcus has better strength performance and long-term stability in desert environment than that from Sporoscarcina pasteurii.