The characteristic features of polyolefin films that have been irradiation crosslinked prior and after orientation have been studied using two types of tests: free shrink and shrink force tests. The results from these two tests have been correlated to provide a novel analysis method for manufacturing process control and provide key parameters for application of the heat-shrink films. The shrink behavior can be described using various graphical tools generated from these tests in the term of tendency of shrink (shrinkage stress) and extent of shrink (unconstrained recoverable elastic strain). The residue energy calculated from the synthesized stress-strain plots provides insight into the mechanism heat shrinkable films.