.UPDATE xx.zd_kakou_info t,(SELECT kakou_id, kakou_lon,kakou_lat,CONCAT('POINT(' , kakou_lon ,' ',kakou_lat,')') as point from xx.zd_kakou_info) k

SET kakou_point = GeomFromText(k.point) where t.kakou_id=k.kakou_id

.SELECT  kakou_id, kakou_lon,kakou_lat,CONCAT('POINT(' , kakou_lon ,' ',kakou_lat,')') as point from xx.zd_kakou_info