However， according to the survey of Wang et al (2004) [3]， 94.2 percent of the nurses， a lack of knowledge and methods to assess pain， Wei 92.4 of the respondents could “fear of addiction” psychological， Varying degrees of pain drug efficacy and mechanism of the lack of understanding of the situation， while 70.3 percent of the nurses when the treatment of postoperative pain is a common misconception that the duties of doctors. The data prompted the existence of general nursing knowledge related to inadequate postoperative pain ......