Abstract: Based on farmland of the oasis in Manasi river valley, Statistical Package for Social Science (SPSS) was applied to carry out principal component analysis and correlated analysis about soil regime in different reclamation years. The result showed that , the plow layer of soil conditions went better in initial reclamation stage , then it began degrading after achieved optimization , and seriously degraded in 10 ~ 15 years which was the warning time. Through synthetic analysis, it could prevent farmland degeneration，provide consultation and theoretic foundation for soil fertility maintenance and recovery.