建立了均质、上下封闭水平无限大油藏中水平井的试井模型，提出了用最小二乘法实现水平井试井分析的自动拟合方法．运用改进的ＬｅｖｅｎｂｅｒｇＭａｒｑｕａｒｄｔ回归方法，使自动拟合方法收敛速度更快．并用实例说明了该方法的实用性． A well testing model of a horizontal well in a homogeneous and vertically closed horizontal infinite reservoirs was established. An automatic fitting method of horizontal well testing for the well test by least square method was proposed. Using the improved LevenbergMarquardt regression method, the automatic fitting method can converge faster. An example is given to illustrate the practicability of this method.