In response to the challenges posed by a Ψ-type gyroscope oscillator, an anchor-free metal oscillator was optimized and improved. A finite element simulation was used to analyze the vibration characteristics of the oscillator in depth, and the oscillator modes and natural frequencies of each order were obtained. The overload characteristics of the oscillator were simulated and analyzed, and the stress and displacement performances of the oscillator under high overload conditions were obtained. The quality factor of the oscillator was further analyzed using a multi-physical field investigation. The results showed that the metal oscillator had a diameter of 15 mm, natural frequency of 12 509 Hz, and modal isolation of more than 3 291 Hz. It could withstand an overload impact of no less than 3.8×10⁴ g, while the quality factor reached 8.7×10⁴. The rationality, effectiveness, and accuracy of the optimization were verified by physical tests and a comparison with a Ψ-type oscillator.