This study aimed to examine factors that influence of investor intention to use online stock trading system at Indonesian Stock Exchange The data collection employed non-probability sampling, using a 5 Scale- Likert survey, distributed to retail individual investor population who are active online trader in the Indonesian Stock Exchange. The survey was mailed to potential investors and posted to investor forum on the internet, and the total participants filling in their survey were 157. The data was analysed using Structural Equation Model (SEM) available on AMOS 18 software program. The study results revealed that satisfaction, risk, trust, benefit, ease of use and usefulness were good predictors for intention to use in the online stock trading system. Ease of use has proven to be a dominant factor to intention to use, while satisfaction has proven as a variable influencing in voluntary technological use.