Relative data of the 2002-2011 Shenyang city affordable housing and commercial housing investment and sales is selected. By empirical data analysis,it is found that Shenyang city affordable housing investment ratio has inhibitory effect on commercial housing prices. Taking Eviews6.0 as an operation platform,unit root test proves whether the data can be analyzed. And then by the co-integration test it is demonstrated the existence of a long-term relationship between the variables,through the Granger causality test and error correction model to prove whether a causal relationship exists between the argument variables finally. The empirical results show that there is co-integration relationship in the long term between affordable housing investment and commercial housing price,and the unilateral causal relationship is established,the Shenyang city affordable housing investment ratio has a certain inhibition of the commercial housing prices.% 从定量的角度说明沈阳市经济适用房投入比对商品房价格的抑制作用。根据2002~2012年沈阳市统计年鉴提供的沈阳市经济适用房、商品房相关数据，以Eviews6.0为操作平台，通过单位根检验论证数据具有可分析性，通过协整关系检验论证变量间存在某种长期关系，最后通过因果关系检验和误差修正模型的构建论证变量间存在单项因果关系。实证结果表明，经济适用房投入比对商品房价格存在抑制作用，经济适用房投入比平均每增加1%。商品房价格将降低0.08%。
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