RESUMO
The paper introduced the theory of the standard score and its application in instructional supervision and analyzed the difference between the standard score and original score in instructional supervision recording and revealed the reasons behind the difference.Besides,the paper pointed out the advantages which included scientificity and stability,providing information of the grade level,being suitable for longitudinal comparison and the crosswise comparison,and disadvantages such as complex calculation and depending on the distribution of original records.Finally,the paper put forward some recommendations on using standard score in instructional supervision:keeping the stability of the supervision expert team,insurance of supervision times,carrying out classified supervision and viewing the scores in its entirety.