Regarding to the agricultural development in Nakhon Pathom area, many farmers and farmer groups still have not much opportunity to learn about the technology of vegetable production in GAP system. It is because they don’t have enough time to learn or participate any training, lacks of extension media and lacks of production promotion continuously. This research focuses on 1) studying and making a handbook and VCD for learning as a guide book for inspecting the quality of vegetable production in GAP system. 2) understanding the opinions of farmers, officers and people who involves toward the handbook and VCD. This research has produced the model media of the vegetable production in GAP system for the farmers with two types, e.g. main media (handbook) and supporting media (pictures and VCD). It was the method that helped the farmers to motivate themselves with knowledge and technology before involving with the process of vegetable production in GAP system. Moreover, there was also a handbook for GAP mentor which could be used to check the farmer’s production and provided an opportunity to exchange the knowledge among the farmers to create a guideline for implementation. The methods in this research which used to find the results of farmer’s perception from media were the Pre-test and Post-test with twenty-five questions and selective four choices to answer each question. The questions for Post-test and Pre-test were the same, but the sequence is different. These questions were tested with the sample group of 137 farmers. The results from both tests were analyzed by the computer program to find the relationship. The results of this research showed that the main media (handbook) was convenient and provided good details for the sample group of farmers to learn by themselves. The results also showed that after learning the process of vegetable production in GAP system from the main media and supporting media (pictures and VCD), the sample group of farmers had more knowledge and better understanding. The average score from the Pre-test before they learned from the media was 13.80, however the average score from Post-test after they had learned increase to 16.74. The scores of Pre-test and Post-test had relationship at significant level at 0.05 with the correlation at .6a94. The scores of Pretest and Post-test had difference at significant level at 0.05, which meant the sample group of farmers’ level of knowledge and understanding had increased after learning the process of vegetable production in GAP system from both main media (handbook) and supporting media (pictures and VCD). The research results could be applied to or developed the media in the future. It was found that the sample group of farmers got the low average score from the tests in the topic of sanitation and security for the producers and the disease protection management. This could be meant to the lacks of knowledge gained of the sample group of farmers from media. Therefore, there would be some improvements for the future media production, including clearer outline and easier understanding.