Purpose By introducing the grey correlation theory to evaluate the implementation effect of various techniques and tactics of athletes, to conduct a substantial verification of the constructed "New Four-phase Index Statistical Method", to explore the scientific nature of the division of each Phase index, and to provide theoretical support for subsequent systematic research and improvement of the theoretical research system of table tennis techniques and tactics. Methods By employing research methods such as video analysis, mathematical statistics, and grey correlation, a model of the "New Four-phase Index Statistical Method" was constructed. According to the contribution rate and total contribution rate indicators of the set tactics in the attack-after-serve phase (serve and 3rd stroke), attack-after-receive phase (receive and 4th stroke), transition phase (5th and 6th stroke) and rally phase (I and II) within the statistical model, the quality characteristics of the eight technical and tactical contributions of player T when playing against the main and reserve players of China were evaluated and analyzed. Results the contribution rate of the first four strokes is closely related to the total contribution rate, which is the main scoring method for T to win the match. T`s 5th and 6th strokes play an important role in the game of attack and defense transition, which is a key turning point of his attack-after-serve phase and attack-after-receive phase into the rally phase. The correlation between the contribution rate during T's rally phase and the overall contribution rate is not very close; similarly, the correlation between T's contribution rate and the total contribution rate is not very close either. With the multi-strokes confrontation, the advantage shown in the match began to decrease slowly. Conclusion By introducing grey relational analysis (GRA), the various technical and tactical effectiveness of the constructed "New Four-Phase Index" can be objectively, reasonably and accurately evaluated, which has certain practicality and feasibility.
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