Abstract: This pater discusses the performance and features meeting the meeds for high-effective filter aid agent. The agent must be with both abilities of "lagrge-area hydrophobicity" for particIe surface and of "flocculability" for fine particles. The design concept of using linear macromolecular surface-active agent as high-effective filter aid one was presented; the macromolecular surface-active agent with large-hydrophobility for mineral surface had been designed and composited. The RCRE filter aid agent as new-generation macromolecular surface-acticve agent has been dedveloped. The filtering test showed that the PCRE has a good filtering performance and can decrease the moisture of filter press cakes of hematite with mean particle size of 7.3μm from 17.7% to 11.2%. In Dong'anshan Iron Mine, the PCRE had decreased the moisture of filter press cakes from 16.2 % to 13.6 %.