本文利用七次人工爆破资料分别计算了甘肃东南部、四川北部、陕西南部、宁夏南部、青海东北部和甘、川、陕接壤地区的地壳平均厚度、地壳表层的平均厚度以及各种地震波的速度。结果表明:甘、川、陕接壤地区的地壳厚度很接近,地壳厚度从西北向东南递减。 In this paper, the average crustal thickness, the average thickness of the crust surface and the velocity of various seismic waves are calculated by using seven times of manual blasting data respectively in the southeastern Gansu, northern Sichuan, southern Shaanxi, southern Ningxia, northeastern Qinghai and the border areas of Gan, . The results show that the thickness of the crust in Gan, Sichuan and Shaanxi bordering areas is very close, and the crustal thickness decreases from northwest to southeast.