Abstract: Geo-synthetics is one kind of important material in geotechnical construction.To use it in the bank protection engineering by using geo-synthetics,soil retention criterion of geo-textile should be assessed.Based on case studies of bank protection projects,lab tests,in-situ tests,locale antitypes tests and observations,and theoretical analysis the authors recommend a new soil retention criterion of textile,O90（210）d90,which challenges the existing criterion of O90（12）d90 that adopted by all the world will be challenged.