The purpose of this study was to investigate the canonical correlation analysis and structural equation modeling between time out factors and professional knowledge of volleyball coaches. Subjects were 275 volleyball coaches who have coached in the 2003 national collegiate, senior high school and junior high school league competitions. The investigation procedure was carried out by a self-designed questionnaire for time out request factors and professional knowledge of volleyball coaches. Seven time out factors and four professional knowledge factors were obtained from principal component analysis and linear relationship between the time out factors and professional knowledge were further investigated. The structural equation modeling was established after the canonical correlation was used for final analysis. The results show: 1. The explain ratio for professional knowledge to time out factor is 23 %, and most of the explain ratio was coming from the first pair of the canonical correlation. 2. The first pair and the second pair of canonical correlation were expressed in the formula below after the finding of canonical weighting, canonical factor and canonical correlation coefficient. χl=-0.512×basic course-0.740×technological theories -0.931×application course-0.456×practical training η1 =-0.797×defend-0.740× mood-0.681×attack-0.506x physiology-0.785×real-time performance-0.618×tactics-0.515×strategy χ2=0.841×basic course +0.165×technological theories +0.193×application course+0.244×practical training η2=0.115×defend +0.524×mood -0.089×attack -0.054×physiology -0.109×real-time performance -0.468×tactics -0.230×strategy 3. After statistic calculation for LISREL's modeling for time out factor and professional knowledge factor, the finding was that model one is the better one withχ2value ratio of 2.97, GFI is 0.908, AGFI is 0.905, CFI is 0.994, RMR is 0.042.