Abstract: In order to inspect easily the degree of self-regulation of athletes in competiton, liter- ature review, theoretical analysis and expert interviews were used to compile the 48items of the initial questionnaire, the 203national professional athletes (the answer to review the way) were investigeted, and through the combination of item response theory as well as the smallest space analysis technology (SSA) , items were reduced and structure of scale were verificated. The results showed that the self-regulation assessment tool have very good reliability and va- lidity (cloning Bach alpha=0.914, χ2/df=1.91, RMSEA=0.069, CFI=0.906) ;self-relu- gation is divided into multi-level complex structure, including the control of inner cognitive (4 items) , to control the behavior of the central (6items) emotional control and the outer loop (4 items) ;scale discrimination parameter (a) , difficulty parameters (b) and each item information are in line with the statistical requirements.