Applying　strain　on　semiconductors　is　a　powerful　method　to　modulate　its　electronic　structures　and　optical　properties.　In　this　study,　the　behavior　of　liquid-nitrogen　exciton　emissions　and　the　longitudinal　optical　phonon-exciton　interactions　of　tensile　strained　[0001]-orientated　ZnO　whiskers　were　investigated　using　in　situ　cathodoluminescence　spectroscopy.　It　has　been　found　that,　under　the　axial　tensile　strain,　various　exciton　emissions　shift　to　the　long　wavelength　and　their　shifts　have　a　linear　relationship　with　the　applied　strain.　This　linear　relationship　and　reversible　shift　suggest　that　the　strain　plays　a　dominating　role　in　manipulating　light　emissions　of　axially　strained　ZnO　whiskers.　(C)　2014　Optical　Society　of　America