My 2.5 year son refuse say to use toilet i don't know if he know he want to go or not i introduced the concept 2 months ago & we took off diaper help!

Toilet training: Best to back off for a few months and let him relax. Buy a "potty" and let him decorate it with stickers. Leave it in your bathroom so every time you use the toilet he can " practice" sitting there or standing there.Boys tend to toilet train later than girls so be relaxed about it.

Toilet training: Toilet training has got to be fun ( like a game for the child) no 2 year old wants to be told what to do. Put him on the toilet or get a potty, first thing on waking up and then after each meal. If he stays sitting on the toilet/ potty for five minutes, praise him, give him a high five, even if he does nothing in the toilet. Be consistent. Eventually, he will start to use the toilet.

Not ready: Put the diaper back on and give your son more time. Everyone develops at their own pace and it is perfectly normal for a 2 1/2 year old to not be ready to use the toilet yet. He will show you signs when he is ready for you to try again (holding his urine longer, asking to go, etc.)

Potty training: A parent can not make a child to be potty trained, but can encourage him to want to do it. At 2-1/2 years! he knows what it is and until he is ready so leave the diapers on. Have the potty easy for him to use. Give reminders to him through the day, such as: "let me know when you need to go potty" and indicate the potty chair. When he tells you before he goes, then goes on the potty, he is ready

Don't force it: It should be a positive experience. If it becomes a struggle, back off for a few weeks. It's not unusual for 2.5 year old not to be toilet trained yet. Here are some suggestions: http://kidshealth.org/parent/emotions/behavior/toilet_teaching.html