Positional control is the important and basic work which is frequently taken by the criminal investigation section of pu摘要阵地控制是公安机关刑事侦查部门对易受犯罪嫌疑人侵害、利用以及犯罪嫌疑人经常涉足的行业、场所，采取公开和秘密的方法进行控制的一项经常性的重要的基础工作。