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The spindle is an important component of two-for-one twisting machine. It gives the yarn twisting through high speed revolving. To solve the problems of resonance and noises, it is necessary to calculate frequency and analysis for spindle. With the establishment of math model, vibrating simulation is applied to natural frequency and vibration mode. It avoids the frequency of exciting force and natural frequency to be same or close. The finite element method studies the structure statics, the dynamics question effective method. It has some steps such as solid model establishment, restraint and load steps increasing, and modal analysis and so on. This method can accurately obtain the result high speed and become the structure mechanical analysis the powerful tool.