The purposes of the research were to create and evaluate the efficiency of Computerassisted Instruction Program for courses of Physical Fitness based on criteria 90/90 and to analyze the learning achievement of the student after using computer - assisted instruction. The samples were 20 first-year diploma students at Rajamangala University of Technology Phra Nakhon North Bangkok Campus. The researcher did the experiment by using pretest and then implementing the computer assisted instruction program for courses of Physical Fitness. After that the students did the posttest then the researcher calculated the efficiency of the computer - assisted instruction and analyzed the learning achievement of students after studying.The result revealed that the efficiency of the computer - assisted Instruction was efficient in criteria 90/90 and learning achievement increased significantly at 0.05.

: The purpose of this research was to 1) study the profile of physical fitness of the undergraduate students of the Faculty of Liberal Arts Rajamangala University of Technology Phra Nakhon. 2) study the factors contributing to physical fitness of the undergraduate students of the Faculty of Liberal Arts Rajamangala University of Technology Phra Nakhon. 3) study the guidelines in building physical fitness of the undergraduate students of the Faculty of Liberal Arts Rajamangala University of Technology Phra Nakhon. The research focused on the quantitative aspects of sport fitness by using equipment to test physical fitness and the questionnaire to measure the factors contributing to physical fitness and the guideline supporting the physical fitness. The questionnaire approved by the experts was used to collect data from 215 students who had been tested for physical fitness. To answer the research questions the data were statistically analyzed and processed using computer program for frequency percentage mean and standard deviation. The results of the study were as follows: 1) a good level of physical fitness of the undergraduate students was sitting and bending forward. An average level of physical fitness included standing & sitting in 60 seconds per one time long jump and 50 meter run. A low level of physical fitness was a 30-second push-up. 2) the factors contributing to physical fitness of the students included 2.1) interest 2.2) physical readiness 2.3) equipment 2.4) need for exercise and 2.5) sport outfits and 3) the guidelines for supporting physical fitness of the students included 3.1) fast walking 3.2) cycling 3.3) swimming and 3.4) running.