The advantages and problems of the multi-sensor data fusion technology are analysed

the methods of the data fusion based on the expert knowledge are suggested

the model of the data fusion is given

and the methods and feasibility of the data acquisition and fusion are analyzed and studied

and the applications combining the examples are shown.The data fusion technology based on the expert knowledge doesn’t contain the complicated mathematical operations and some parameters which are difficult to ascertain.It is comparatively simple

has very strong practicability

and can be widely applied in the data fusion of the multi-sensor system.