Abstract: Aiming at cases of setup and measurement about static work point in experiment circuit, instructive process is provided based on the schematic system structure by soft of Multisim 10 for speeding up the efficiency of knowledge studying. The Multisim soft is easy to learn and use. Students are induced to research the principle of the working circuit actively by parameter adjusting so as to train students to think independently. The results show that students' abilities of analyzing are trained through the process of virtual simulation. The foundation of experiment is built. Student's ability of problem handing is promoted by such a process.

Key words: single transistor amplifier, virtual simulation, instructive teaching