Despite the importance of clinical trials in developing a new drug, paper based clinical trial is still costly and time-consuming. The process of a clinical trial has not kept up with available information technologies. We identify two major problems in paper based clinical trial. They are time delay and poor error control. To solve the problems information technologies are used in certain areas of clinical trial, but it is still restricted and partially helpful. This paper first explains the two problems in the process of paper based clinical trial and introduces four available information technologies that can help clinical trial in implementing electronic clinical trial (ECT), where information technologies are used in the whole process of clinical trial.