本文主要讨论地震地质条件和激发条件。根据相对的和发展的概念,提出了地震地质条件的难易是随着勘探的目的和对象的改变而发展的。在有的勘探区中,浅层条件是主要的困难,而浅层条件中,激发条件又是最重要的。为了获得高讯噪比的记录,本文阐述了在中等速度层中激发与合理地选择震源参数的重要性。 This paper mainly discusses the seismic geological conditions and excitation conditions. According to the concept of relativity and development, it is proposed that the difficulty of seismic geological conditions is developed with the purpose and object of exploration. In some exploration areas, the shallow conditions are the main difficulties, while the shallow conditions, the excitation conditions is the most important. In order to obtain a record of high signal-to-noise ratio, this article describes the importance of excitation and reasonable choice of source parameters in a medium velocity layer.