The morphology and crystallization kinetics of oligoamidophosphates of molecular weight between 300 and 1800 prepared with various reaction times (1–12 hr) and different mole ratios of poly-caproamide and orthophosphoric acid (PA/AC = 0.5–1.6) has been studied. Very large, thin (several microns thick) or three-dimensional (diameter up to 8–10 cm) spherulites from aqueous solutions of oligoamidophosphates have been observed. Fully transparent lamellae with perfect angles, about 0. 2 cm thick, 1–12 cm wide, and 6–8 cm long can be formed too. The investigation of the kinetics of isothermal crystallization of oligoamidophosphates with various molecular weights in the temperature range of −5 to +90°C showed the well known bell-shaped curves. The dependence of the spherulite growth rate on the molecular weight generally observed was confirmed. It has been found that the morphologic and kinetic changes, established in the crystallization of the products prepared under various conditions (duration of treatment, mole ratio, acid concentration), are the exclusive result of differences in the molecular weight of the oligomers obtained.