Two kinds of polyvinyl chloride-polyethylene-polyamine supported palladium complexes were synthesized and characterized by XPS, TG, DTX TEM, etc. These complexes are efficient catalysts for Heck reaction of acrylic acid with aryl iodides in air at the low temperature (50 degrees C) using 0.125 mol% of the catalysts. Effect of amount of the catalyst indicates that the Heck reaction acrylic acid with iodobenzene can be carried out with tiny amount of the catalyst (0.02%) at 90 degrees C. The complexes have high thermal stability and can be easily recovered and reused. Yields of making cinnamic acid were even high as 68.3 and 78.0% respectively for Heck reaction of acrylic acid with iodobenzene by using the two complexes that were recovered for 12 times. (c) 2005 Elsevier B.V. All rights reserved.