A new equality,AW=AF·AP,is deduced from mechanics formula W=FS,that is,AW(ap- praisal work)equals to that AF(appraisal force)times AP(appraisal path).Under the framework of this e- quality,from the angle of mechanics and based on appraisal path,this paper demonstrates what appraisal path is and analyzes the influencing factors of appraisal path and appraisal force of its related factors.