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Mechanical control of magnetic order through strain is an important and promising approach in the development of advanced spintronics devices.Here,using a real-space phase field model based on Ginzburg-Landau theory,we explore the uniaxial strain modulation of topological phase transition in ferromagnetic thin films.Different from the straininduced anisotropic Dzyaloshinskii–Moriya interaction(DMI),a magnetoelastic coupling of magnetization and strain is introduced in the phase field model to describe the anisotropic deformation of skyrmion lattices and the strain modulation of skyrmion phase transition.The phase field simulations show that a uniaxial tensile strain in the ferromagnetic thin films can not only change the wavelength and propagation direction of spin spiral phase but also induce novel topological phase transitions of skyrmions.Under specific magnetic fields,the ferromagnetic thin film exhibits the ferromagnetic-toskymion and skymion-to-helical phase transitions serially when the uniaxial strain increases,which are different from those induced by uniaxial stress in bulk ferromagnets.The present work not only provides a magnetoelastic coupling mechanism on the uniaxial strain control of topological magnetic structures but also suggests an effective way to tune the electromagnetic properties of ferromagnetic thin films for new generation of spintronic devices based on skyrmions.