This study was conducted to determine the effect of trust, ease of use, quality of information and price perception on decision buying consumer of online.This research uses quantitative approach which is done by survey. data collection techniques used in this study by questionnaire method (questionnaire). The sample of this research is a student Muhammadiyah University of Yogyakarta students who have done online transaction at least 2x (times) in the last 5 months. The number of samples in this study as many as 96 respondents. Sampling technique used is non probability sampling, with purposive sampling method. Analytical tool in the study using multiple linear regression analysis, uji f and uji t Based on the results of the analysis and discussion, it can be concluded that significantly the variables of trust, ease, quality of information and price perceptions can influence online purchasing decisions while trust, information quality and price perceptions have a significant positive effect on purchasing decisions and ease No effect on purchasing decisions by online