首先编写一段代码，存为.stx 文件（例如sql.stx），然后在editplus的菜单栏Tools-> Preferences->Files->Setting &syntax，,点add按钮，如下图：
在弹出框中填写上SQL，如下图：
再点击Advanced按钮，在弹出框的file Extensions栏位也填上SQL,如果有多个扩展名，之间用“；”隔开（例如：sql; db2），如下图：
然后在syntax file栏位填上sql.stx文件所在的路径，如下图：
下面是我的sql.stx文件源码（转载：http://hi.baidu.com/wriwgqzuyvfpvwe/item/c0cc27d67299d616d80e445b）：
#TITLE=SQL
; SQL syntax file written by KK.
#DELIMITER=,(){}[]-+*%/="'~!&|<>?:;.
#QUOTATION1='
#QUOTATION2="
#LINECOMMENT=--
#COMMENTON=/*
#COMMENTOFF=*/
#SPECIAL_STX=SQL
#KEYWORD=SQL Tags
;VAR
sql_variant
datetime
smalldatetime
float
real
decimal
money
smallmoney
bigint
int
smallint
tinyint
bit
ntext
text
image
integer
timestamp
uniqueidentifier
nvarchar
nchar
varchar
char
CHARACTER
varbinary
binary
#KEYWORD=Reserved words
ADD
ALL
ALTER
AND
ANY
AS
ASC
AUTHORIZATION
AVG
BACKUP
BEGIN
BETWEEN
BREAK
BROWSE
BULK
BY
CASCADE
CASE
CHECK
CHECKPOINT
CLOSE
CLUSTERED
COALESCE
COLUMN
COMMIT
COMMENT
COMMITTED
COMPUTE
CONFIRM
CONNECT
CONSTRAINT
CONTAINS
CONTAINSTABLE
CONTINUE
CONTROLROW
CONVERT
COUNT
CREATE
CROSS
CURRENT
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURRENT_USER
CURSOR
DATABASE
DBCC
DEALLOCATE
DECLARE
DEFAULT
DELETE
DENY
DESC
DISK
DISTINCT
DISTRIBUTED
DOUBLE
DROP
DUMMY
DUMP
ELSE
END
ERRLVL
ERROREXIT
ESCAPE
EXCEPT
EXEC
EXECUTE
EXISTS
EXIT
FETCH
FILE
FILLFACTOR
FLOPPY
FOR
FOREIGN
FREETEXT
FREETEXTTABLE
FROM
FULL
GOTO
GRANT
GROUP
HAVING
HOLDLOCK
IDENTITY
IDENTITY_INSERT
IDENTITYCOL
IF
IN
INDEX
INNER
INSERT
INTERSECT
INTO
IS
ISOLATION
JOIN
KEY
KILL
LEFT
LEVEL
LIKE
LINENO
LOAD
MAX
MIN
MIRROREXIT
NATIONAL
NOCHECK
NONCLUSTERED
NOT
NULL
NULLIF
OF
OFF
OFFSETS
ON
ONCE
ONLY
OPEN
OPENDATASOURCE
OPENQUERY
OPENROWSET
OPTION
OR
ORDER
OUTER
OVER
PERCENT
PERM
PERMANENT
PIPE
PLAN
PRECISION
PREPARE
PRIMARY
PRINT
PRIVILEGES
PROC
PROCEDURE
PROCESSEXIT
PUBLIC
RAISERROR
READ
READTEXT
RECONFIGURE
REFERENCES
REPEATABLE
REPLICATION
RESTORE
RESTRICT
RETURN
REVOKE
RIGHT
ROLLBACK
ROWCOUNT
ROWGUIDCOL
RULE
SAVE
SCHEMA
SELECT
SERIALIZABLE
SESSION_USER
SET
SETUSER
SHUTDOWN
SOME
STATISTICS
SUBSTR
SUM
SYSTEM_USER
TABLE
TAPE
TEMP
TEMPORARY
TEXTSIZE
THEN
TIMESTAMP
TO
TOP
TRAN
TRANSACTION
TRIGGER
TRUNCATE
TSEQUAL
UNCOMMITTED
UNION
UNIQUE
UPDATE
UPDATETEXT
USE
USER
USING
VALUES
VARYING
VIEW
WAITFOR
WHEN
WHERE
WHILE
WITH
WORK
WRITETEXT
