The mechanical parameters of lime-ash improved aeolian soil were contrastively analyzed by means of laboratory experiment in this thesis, so as to study the feasibility of using the lime-ash improved aeolian soil. And then the conclusions were drawn as follows. ( 1 ) The process of strength forming of lime-ash improved soil is a process of hydration reaction, and the whole process will last longer with monotonic increasing of the strength of lime-ash improved soil. (2)It is relatively difficult to increase the shear strength of aeolian soil by merely increasing the compaction work, while the particle-size gradation of the aeolian soil can effectively be improved by the use of lime-ash improved aeolian soil via a certain mixing proportion. (3) The compactness degree of the lime-ash improved soil has greater effect on the cohesion force, and the shear strength of the lime-ash improved soil will increase with the increase of the compactness degree. (4)It is suggested that the 96% compactness degree with the 11. 4% porosity ratio can serve as the compaction standard of the railway subgrade with lime-ash improved soil. ( 5 ) The lime-ash-soil ratio, compactness degree, moisture content and the confining pressure are the important factors affecting the shear strength characteristics, among which the lime-ash-soil ratio is the most important one.%采用室内实验等手段对二灰土改良风积土力学参数进行对比，研究二灰土改良风积土的可行性。可得结论：(1)二灰改良土强度的形成即为水化反应过程，整个过程历时较长，在此过程中二灰土改良土强度单调递增；(2)单纯依靠增大击实功提高风积土抗剪强度较为困难，通过一定配比进行二灰土改良可有效改善风积土的粒径级配；(3)二灰改良土的密实度对黏聚力的影响较大，改良土的抗剪强度随之增大；(4)选取密实度96%，孔隙率11．4%作为二灰土改良土路基的压实标准；(5)灰土比、密实度、含水率与围压为影响二灰改良土抗剪强度特性主要因素，其中灰土比影响最为显著。
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