The present situation of differential technology is introduced

and the process and main outcome of the wide locked coefficient multi-piece differential friction pair research are expatiated.With the differential friction-sliding mathematic model to 4×4 vehicle is found

the research on the complicated work condition to friction pair of differential mechanism locked friction is completed

and typical work condition of high performance vehicle differential friction and sliding is obtained.Based on the use and design require

the friction and abrasion characteristic parameters

as well as the testing method are defined.With the test under two kinds of lubricate condition

the friction and abrasion characteristics of many differential friction pair（includes 3 kinds of material and 11 test piece） are researched

the friction pair structure design

friction material research and lectotype direction

the load-add scheme strategy of the automatic friction differential are obtained

a friction pair theory model machine whose locked coefficient can be controlled between 0.1and 1.0 is formed.The technique foundation for achieving high performance vehicle differential is settled through the research.