An attempt has been made to prepare some new polyamide hydrazides of high thermal stability with different dicarboxylic acid chlorides by the solution polymerization technique. The polymerization was carried out at -20°C. Amide linkage was present in each polymer unit. Results of thermal degradation and thermogravimetric analysis indicate that these polymers melt or decompose above 350°C, and the steep weight loss of the polymer takes place in the range 360–390°C. Most of the polyhydrazides are soluble in organic solvents.