本文介绍了如何在长城0520系列微机(及其兼容机)的BASIC环境下直接从以dBASEⅢ数据库文件形式存放的地震目录文件中挑选任意时间、空间和强度范围内的地震数据,给出了可从dBASEⅢ数据库文件和普通数据文件中挑选地震目录的通用计算程序,扼要说明了程序的主要数学原理,并介绍了程序的功能和使用方法,可供在实际工作中应用和参考. This article describes how to select the seismic data in any time, space and intensity range directly from the seismological catalog files stored in dBASE Ⅲ database file under the BASIC environment of the Great Wall 0520 series microcomputer (and its compatibles) dBASE Ⅲ database files and ordinary data files to select the earthquake catalog of general-purpose computing programs, a brief description of the main mathematical principles of the program and describes the program’s functions and methods of use for practical application and reference.