Abstract: A new system of salt-resisting colloidal dispersion gels (CD gels) is researched and prepared. It contains nonionic polyacrylamide whose appropriate degree is from 800 mg/L to 1500 mg/L, acetic chromium whose appropriate degree is from 80 mg/L to 160 mg/L and formaldehyde whose degree is from 200 mg/L to 400 mg/L, etc. The CD gels have good salt-resisting and good water shutoff properties. Sixteen wells is efficacious within the eighteen field testing wells.Good effectiveness is acheved after field test.