just want to know if possible to apply china visa somewhere in Thailand? but i'll go from Malaysia

It is hard to give you a correct answer, the visa rule is different countries and different occassions. If you live or work in Thailand, it is possible for you to get a China visa in Thailand. If you are just a temporary visitor to Thailand, maybe your application will be denied. You have to submit your application to try to your luck!

You said you ordered ticket from Kuala Lumpur, do you mean you will fly to China from Kuala Lumpur or book the tickets from Kuala Lumpur but you will fly to China from Thailand?