In　construction　of　CSCD　system　for　distribution　engineering,　there　existed　two　main　problems:　the　design　security　control,　the　call　speed　and　reuse　efficiency　of　CAD　drawings.　This　paper　has　designed　the　electronic　signature　and　the　electronic　seal,　the　decision　program　of　validity　of　CAD　files　to　solve　the　security　problem　after　the　risks　in　their　circulating　process　were　analyzed.　Furthermore,　the　three-layer　distribution　network　topological　structure,　the　Classified　and　layered　storage　methods,　the　smart　client　and　the　knowledge　push　methods　of　CAD　files　have　been　developed　to　increase　the　call　speed　and　reuse　efficiency.　The　technical　methods　have　been　verified　feasible　in　the　practical　operation　of　FJCD　system.　©　(2013)　Trans　Tech　Publications,　Switzerland.