For the purpose of developing local monitoring system of drug abuse among youth, and adequately catch the local substance abuse characteristics, so as to well develop the preventive network and measures, the study attempt to explore the characteristics of drug abuse trends among youth at Kaohsiung city. Besides, invoking by the Monitoring the Future (MTF), the study explored the drug use among school students which have been systematically ignored by previous studies. Moreover, the study adopted ADAM’s drug motoring system developed by U.S.A. to survey the juvenile delinquents so as to understand the demographic trends, crime types, drug use history, the connection to drugs, and involvement in drug market etc. It is expected that through above research, the study adequately developed the monitoring model. A total of 40 questionnaires had been distributed to Kaohsiung Juvenile Detention House, 34 of which are valid. The response rate is 85%. In addition, a total of 500 questionnaires had been distributed to the students in Kaohsiung City, 424 of which are valid. The response rate is 84.8%. Results: Among the students group, they do not drug abuse. Among the delinquent juveniles who had used any of the illicit drugs, the drug abuse prevalence was 91.18%. Among delinquent juveniles, the most used drug was Ketamine (85.3%); the next being ecstasy (MDMA) which accounted for 47.1%; Amphetamine accounted for 35.3%. The quantity of ketamine and amphetamines used on typical ranged from 0.3-0.7 grams. The mean amount of ketamine and amphetamines consumption were about 500 NT dollars per users and the mean amount of ecstasy consumption were about 390.91 NT dollars per users. At this point, the standard deviation was large, the quality and quantity of drugs were unstable. For more specific information about the study was discussed in the text.