The load components of oil tube in pumping unit wells are described and formulized.The bending load and tensile load of oil tube at the top end is measured with sensors of strain gauge in real time.The test shows that a certain bending load exists on oil tube with different mandrel hanger,and the fluctuation of tensile load is affected much by the diameter of pump and the frequency of stroke,the cyclic load character at top end of tube string is larger than 0.6 in general.The comparison of computing result ...