This article starts with analyzing the principle of operation，components and advantages of photo conductive illumination and ventilation system. It focuses on a typical city in cold areas, and adopts the ways of questionnaires research，site survey and data analysis etc. the article investigates the details of the status and requirement of indoor environment, general applicability of the technique and economic benefits, then draws the conclusion that the photoconductive illumination and ventila-system is feasible in college teaching building.