On the basis of further deduction of diffusion equation,the profiles of single-shock and multi-shock fault scarps along middle and eastern segments of Changma fault zone are fitted and calculated by using mathematical equation models Ⅰ,Ⅱ and Ⅲ. The disperse fault scarps along the Altun fault zone and Changma fault zone are analyzed by using the maximum slope value-fault throws(tgθs-2a)pattern. The results show that for the fault scarps of Changmafault zone the mass diffusion coefficient K=2.1-3.4m²/10³ a and along Altun fault zone there are 4 sets of seismic fault scarps whose ages are 0.6 ka,2-2.7 ka, 4ka and 6-6. 6 ka respectively.