修改my.ini，在[mysqld]下加上
default-storage-engine=INNODB
其中红色字体部分是要指定的引擎名称。
用sql语句修改已经建成表的引擎：
alter table tableName type=InnoDB
下面贴出我的my.ini文件供参考(http://www.my400800.cn)：
[mysqld]
basedir=C:\Program Files\VertrigoServ\Mysql\
datadir=C:\Program Files\VertrigoServ\Mysql\data\
port =3306
key_buffer =64M
max_allowed_packet =1M
table_cache =128
sort_buffer_size =512K
net_buffer_length =8K
read_buffer_size =256K
read_rnd_buffer_size =512K
myisam_sort_buffer_size =68M
default-storage-engine=INNODB
[mysqldump]
quick
max_allowed_packet =116M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer =20M
sort_buffer_size =20M
read_buffer =62M
write_buffer =62M
[myisamchk]
key_buffer =20M
sort_buffer_size =20M
read_buffer =62M
write_buffer =62M
[mysqlhotcopy]
interactive-timeout