In　operating　conditions,　the　mechanical　structure　of　a　laser　tracer　measurement　system　resonates　with　the　motor.　To　ensure　the　measurement　precision　of　the　laser　tracer　measurement　system,　this　resonance　should　be　avoided.　In　this　research,　we　proposed　a　method　for　analyzing　the　influence　of　the　modal　parameters　of　the　mechanical　structure　of　a　laser　tracer　measurement　system.　Based　on　the　mechanical　structure　of　a　two-degrees-of-freedom　system　and　the　modal　analysis　theory　of　the　finite　element　method,　the　study　was　conducted　to　analyze　the　effects　of　structural　material　density,　elastic　modulus,　and　different　materials　on　the　inherent　frequency　of　the　system.　The　experimental　results　show　that　the　natural　frequency　of　the　system　increases　with　increasing　structural　density　and　decreases　with　increasing　structural　stiffness,　and　the　influence　of　different　materials　varies　greatly.　The　pasting　method　can　effectively　increase　the　stability　and　guarantee　the　measurement　precision　of　the　system.　This　research　provides　a　basis　for　analyzing　vibration　characterization,　vibration　fault　diagnosis　and　prediction,　and　the　optimal　design　of　structural　dynamics　characteristics　for　the　mechanical　structure　system　in　laser　tracer　measurements.　©　2023　Editorial　Board　of　Journal　of　Harbin　Engineering.　All　rights　reserved.