Shearing mechanical behaviors of composite joints model with consist of two kinds of different characters of joints and various inter-appearances in one plane have been studied in this paper. After a series of experiments on brittle-brittle

brittle-plastic

plastic-plastic type composite joint models

follow conclusions have been gotten. The shearing strength of composite joints has a relation not only with the area of sub-joints

but also with the times of inter-appearances of two sub-joints(K); and the shearing strength of composite joints has a relation with the shearing direction

that is to say

the shearing deformation-failure of composite joints is gradual. These conclusions are very important and useful for practical engineering.