〔Abstract〕 In this paper , usedβconvergence test on per capita GDP of five northwestern provinces , we found that since 2007 eco-nomic differences in the municipal level is gradually reduced . The absolute convergence rate is 2.64% per year . It needs about 26.6 years to eliminate the half economic gap . Convergence rate under the conditionβfactors openness , such as open degree and government actions , increased to 4.03% . These two factors had a significant effect on improving the economic structure in Northwest China . Meanwhile , spa-tial lag model (SLM ) explores the effects of space factors on economic convergence . The results showed that the unbalance of the sur-rounding neighbors had very significant influence on the growth of regional economy . Therefore , we should increase the angle of openness and public expenditure , breaking the barriers of administrative divisions , reducing regional differences in promoting coordinated regional balanced development .%本文通过对西北地区人均生产总值的β收敛的检验，发现2007年以来地市级层面上的经济差异正在逐渐变小。绝对β收敛速率为每年2.64％，即要消除一半的经济差距大约需要26.6年的时间。对外开放程度、政府行为等因素作用下的条件β收敛速度提高到4.03％，说明二者对改善西北地区“二元经济结构”具有显著促进作用。然后采用空间滞后模型（SLM ）探讨了空间因素对经济收敛的影响，结果表明区域经济增长的不平衡受周边邻居影响非常显著。因此，应从提高对外开放程度和政府公共开支的角度，打破行政区划的壁垒，缩小地区间差异促进区域协调平衡发展。
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