The Purpose of this Project focus on the influence and the transformation with or without using the Adjutant Teaching Equipment towards teenaged mentally retared bowling skill. The sixteen study objects are the students from Taipei Association for Mentally Retared fitness of bowling. Before the first class starts, they were separate randomly into control group (did not use the Adjutant Teaching Equipment) and experimental group (use Adjutant Teaching Equipment), each of the group has eight people. The experiment last three months and there will be ten classes. Average of two game as the dependent variable in order to compare the study objects variation on bowling skills. The tested data will go through the SPSS system for paired-sample t test, the result of α=0.05. The result of this research showed that by using the Adjutant Teaching Equipment to help teenaged mentally retared has an obvious assist on their bowling skills(t=4.112, p<.05).