Contrast　to　the　conventional　sanitation　system,　the　ecological　sanitation(EcoSan)　system　has　more　advantages　in　accordance　with　the　natural　law　of　flow　of　nitrogen,　phosphorus　and　other　substances,　and　can　take　an　important　role　in　resources　saving.　On　the　basis　of　health　and　environmental　protection,　the　eco-san　system　is　much　more　economical,　in　the　meantime,　the　harmony　between　human　and　nature,　as　well　as　sustainable　development,　can　be　achieved.　By　analyzing　the　characteristics　of　the　application　in　building　drainage　and　the　problems　in　practical　application,　the　prospect　and　existing　challenges　of　this　system　in　China　are　discussed,　at　the　same　time,　related　suggestions　are　put　forward.