The invention provides a conductive mosaic cement containing a complex additive. For the cement, No. 95 polymerized rosin is selected as a substrate, the powered carbon is selected as a conductive filler, metal powder is selected as an intensifier, and the three materials are mixed by virtue of normal temperature grinding according to certain weight ratio, thus preparing the conductive mosaic cement of the invention. The cement containing the complex additive in the invention is especially applicable to cementing brittle composite and preparing the sectioned sample of the brittle composite without a processed stress liner, besides, the prepared sample can directly be used for microanalysis of electron beams and can also be separated into single sample for analysis and study at temperature of about 100 DEG C.