This research aims to study the effects of practice playing the ball with two hands to the bottom (Underball) in the student's high school volleyball last year 4/3 sample is a sample taken from a specific random (Purposive sampling). As a female who has played the ball with two hands to the bottom (Underball) is not more than 10 persons defined criteria and then practice for a period of 6 weeks, 3 days, store the data in testing the two children play, training, tools, bottom (Underball) prior to the workshop (Pre-test) and training (Post-test), 6 weeks, and then bring Mu.That have been analyzed by the average. Best standard flat percent biang changed to compare the differences within the Group during the first training (Pre-test) and after (Post-test) with training statistics (dependent t-test), and compare the differences of the two ball playing skills. (Underball) a statistical test of significance at the .05 level. From the study it was found that after testing a sample of the training program. Has been changed. After six weeks of training the statistical significant at .05. Research model of development, play ball with two hands to the bottom (Underabll) that affect a student's high school volleyball last year 4/3 before and after the training is significantly different at .05 level statistics.
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