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冲次即在抽油机井里抽油杆每分钟上下重复运动的次数，抽油机冲次越高，油井产量越高。若产液量偏高，但冲次却无法跟上趟则会出现小马拉大车的情况，最终使产量下降。低产井抽油机若冲次过高则会出现大马拉小车的情况，时常发生空抽，同样会降低抽油机工作效率，影响石油产量。基于该问题做好抽油机冲次调节与监控是解决的关键，在抽油机控制过程里引入调速传动后，结合井下状态对抽油机冲程频次与上下行程速度进行调节，使泵的漏失减少，得到最大出油量，但在期间应做好抽油机冲次计数的监控，便于随时掌控抽油机冲次情况，确保抽油机始终维持在最佳运行状态，减少人员下井次数。而本文则结合实际对柴油机驱动抽油机冲次监控器的设计与应用给出几点体会。“,”the number of strokes is the number of times that the sucker rod moves up and down repeatedly every minute in a pumping well. The higher the pumping unit strokes, the higher the oil well production. If the liquid production is on the high side, but the flushing times can’t keep up with the times, there will be the situation of small horse pulling cart, and finally the production will decline. If the pumping unit of low production wells has too high impact times, it will appear the situation of big horse pulling small car, and often empty pumping, which will also reduce the working efficiency of the pumping unit and affect the oil production. Based on this problem, the key to solve the problem is to adjust and monitor the pumping unit stroke times. After introducing the speed control drive in the pumping unit control process, the stroke frequency and up and down stroke speed of the pumping unit are adjusted combined with the downhole state, so as to reduce the leakage of the pump and obtain the maximum oil output. However, during this period, the pumping unit stroke count should be monitored to control the pumping unit stroke times at any time, To ensure that the pumping unit is always in the best operation state, reduce the numberof personnel down the well. In this paper, combined with the actual design and application of the diesel engine driven pumping unit, some experience is given.