In　order　to　drive　beam-pumping　unit　with　brushless　DC　motor　(BLDCM),　a　kind　of　motor　speed　regulator　was　investigated.　When　pumping　unit　is　in　up　stroke,　BLDCM　is　power-driven;　when　in　down　stoke,　pumping　unit　is　braked　by　BLDCM.　To　meet　the　operation　mode,　PI　double　closed　loops　control　strategy　and　Pulse　Width　Modulation　(PWM)　are　applied.　Simulation　and　test　in　field　show　that　our　design　has　good　control　effect　and　popularizing　value.