Abstract: The paper put forward an information detection method using fuzzy data fusion technology of multi-sensor.The method uses multi-sensor to monitor parameters of temperature,humidity,ventilation amount,and others of monitored environment, then multivariate information obtained by multi-sensor are made fuzzification and accurate state parameter estimation of the monitored environment is obtained by use of synthetic operation and decision rule of data fusion center,which can be used in the final information decision.The experiment result showed that the method can improve accuracy rate of environment state monitoring effectively,increase confidence degree of state monitoring,and improve performance of environment monitoring system.