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Because the hard areas of soil had affected the growth of crops seriously in some dry lands of China, the Chinese government tried to extend sub-soiling but the effect was not significant. In order to find out the limiting factors of sub-soiling extension, a nationwide survey was carried out. The procedure of the survey was introduced in this paper, including questionnaire survey, field survey and telephone interview. The contents of the survey included the total area, operation standard, field equipment, technique mode, cost-benefit, effect on crop yield of sub-soiling and so on. According to the investigation, this paper analyzed the main factors that influence sub-soiling extension. The result of Synthetic Evaluating Methods shows that high cost and price is the most critical factor, which has become an outstanding problem especially affected by the price hiking of fuel in recent years. The other major factors are lack of promotion fund, weak propaganda, lack of large tractors, small operation scale, lack of subsoilers, lack of extension workers, complex technical standard. Then it provided some suggestions on implementing sub-soiling subsidy, giving funding support for propaganda and extension, inclining the subsidy for purchasing agricultural machinery to machines related to sub-soiling, developing the agricultural machinery service organizations to enlarge the field operation scale and formulating technical standards according to local conditions.