The purpose of study was to use the many facet Rasch model to analyze the validity and reliability of tactical pattern on the singles game in badminton. Based on the method of Safrit's (1989) domain-referenced validity was to survey expert by questionnaire, which was to establish the logical validity of observation table of tactical pattern in badminton singles game. The validity and reliability of estimation was done by using the Facets program. The results of study indicated that: 1. The seven tactical pattern of observation table had been established on the singles game in badminton. The fixed test of raters showed that judges were all the same and rater agreement was 72.0%. The Rasch separation reliability of tactical pattern was .77.2. The tactical pattern of observation table had been confirmed that had validity and reliability. The raters of fixed test were showed that judges were all the same and rater agreement was 98.2%. The normal test of raters showed that rater was representative and validity was proved. The data-model fit proved tactical pattern was validity and Rasch separation reliability of tactical pattern was. 63. The fixed test of tactical pattern showed that difficulty was discriminative. The normal test showed tactical pattern was representative and validity. The conclusion suggested that by observing the following seven tactics, including service with attack, attack after receive, hit to whole court with attack by varied basic skills, attack by changeable speed, downward hit to gain control over net, attack after defending, gain control over the front net, we could analyze the features of single badminton players. With his frequently-used and forte/weak tactics, we could help a single player win the game by reorganizing strategy.