Since environmental information in greenhouse had the characteristics of slow changing, great redundancy, and strong spatial and temporal correlation, a energy transmission model of wireless sensor network (WSN) was proposed based on event-driven and data fusion for the acquisition of environmental information in greenhouse. With the energy transmission model the field test was conducted. The results showed that the data transmission model based on event-driven could reduce the data transmission frequency 83.8%. The data fusion based on data support function could calculate each weighted value of the original data size according to the degree of association among the data, and was better than the arithmetic mean.