Abstract: The M-K. groove model and inclined-groove model are used to calculate forming limit diagrams for sheet metal having difenent properties. The influence of different strainpaths on forming limit diagrams is analysed, A comparison is made between the results of calculations and double-plank experiments. The results, both experiments and calculations, show that curved strainpaths have obviouns influence on forming limit diagrams, so the linear strainpaths must be ensured when making forming limit diagrams experimentally.