Abstract: Using N,N-methylene-bis-acrylamide as crosslinker and potassium sulfate as an initator .super-absorbent composite based on bentonite and starch and poly(acrylic acid-co-acrylamide) was prepared by polymerization and cross linking reaction.The influences of the amount of bentonite,initiator agent,crosslinking agent,neutralization degree and the mass ratio of acrylic acid to acrylamide were investigated. The influence of bentonite on water absorption retentivity and water rates of composite were discussed. Th...