Due to complex geological conditions of mountainous area and poor receiving condition, the original material SNR is low. It is difficult to accurately identify the effective velocity before residual static correction. The easily identified velocity can be gained after several times of velocity analysis and residual static correction. But because of the error of initial velocity and initial statics, the iterative of residual static correction is always not convergent so the real underground structural configuration can not be gained. Only relatively reasonable initial velocity calculating method can ensure the real and reasonable imagery.%山地地区地表和地下地质条件复杂，接收条件差，原始资料信噪比低，做剩余静校正前很难准确的识别有效速度，经过几次速度分析和剩余静校正后，才得到容易辨认的速度，但是由于初始速度和初始静校正量的误差问题，往往剩余静校正的迭代不是收敛的，得不到真实的地下构造形态。只有采用比较合理的求取初始速度方法，才能保证得到真实合理的成像。
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