A phase-field-crystal model is used to simulate microcrack growth under disturbance strain. Influences of disturbance frequency and temperature on growth behavior and stability of microcrack are discussed. It shows that: ① Fracture mode is affected by temperature of the system under certain conditions. ② Influence of disturbance frequency on crack propagation behavior is affected by temperature of the system. ③ Stability of crack decreases firstly and then increases with the increase of disturbance frequency. The increase of temperature leads to the decrease of crack stability.