1>下载完成后,解压压缩文件至本地某路径下,例如c:\instantclient 。 2>在此路径下建立文件夹NETWORK/ADMIN,在ADMIN文件夹下建立tnsnames.ora文件,文件内容即为希望连接的数据库的TNS信息。例如: WORCL = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.4)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) ) ) 启动PL/SQL Developer,在登录窗口界面,点击取消按钮就可以进行主界面,点击Tools->Preferences,在Connection中需要配置如下两个参数: Oracle Home:c:\instantclient OCI Library:c:\instantc lient\oci.dll lient\oci.dll