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I installed Oracle10g today.I tested the database system when the installation process was finished. I found that I could not connect the database by
using  iSQL*Plus. It showed that "ERROR - ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务".

I had got the solution by the google:

  1. Open the ""<OracleHome>/network/admin/listener.ora" file in the host,and you will see:
   SID_LIST_LISTENER =
   (SID_LIST =
     (SID_DESC =
       (SID_NAME = PLSExtProc)
       (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
       (PROGRAM = extproc)
     )
   )
  2. Add the following lines after the 7th line in the above
            (SID_DESC =
       (GLOBAL_DBNAME = ORACLE)
       (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)  
       (SID_NAME = ORACLE)
      )
  3. At last the content of the file become to the following section:
 SID_LIST_LISTENER =
   (SID_LIST =
     (SID_DESC =
       (SID_NAME = PLSExtProc)
       (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
       (PROGRAM = extproc)
     )
     (SID_DESC =
       (GLOBAL_DBNAME = ORACLE)
       (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)  
       (SID_NAME = ORACLE)
      )
   )
  4. Save the file and restart the TNSListener service in the host. That's OK!