A flow and heat transfer numerical simulation was performed for a 2D gaseous flow through microchannels in the slip regime to investigate the effects of rarefaction .In the paper ,it denotes the normalized governing equations .The rar-efaction is simulated by varying Knudsen numbers(Kn numbers) .The numerical results demonstrate that Poiseuille numbers (Po numbers) are significantly higher for the flow near the entrance and the exit .Then the downstream values of Po num-bers change slightly along the channel .The lower Po number is expected ,since the slip condition implies less shear stress a-gainst the wall and a higher Kn number means larger slip .In general ,our analytical formulas show good agreement with the related experimental data .In the end ,it verifys that the average Nusselt number (Nu number) decreases with the increase of Kn number .%在微通道二维简化模型下，通过控制方程的无量纲化处理，对空气在滑移区稀薄性影响下的流动特性进行了研究与数值分析。研究结果表明，泊肃叶数（ Po数）在进口与出口处较大，沿程其他位置的 Po数为定值。随着克努森数（ K n数）的增加，稀薄性增强，壁面滑移变大，Po数减小。文中给出 Po数的一维理论表达式，发现该公式与实验值较吻合。最后，通过对比验证表明，平均努塞尔数（Nu数）随着 Kn数的增加而减小。
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