一般不用the reason of.
the reason for 常用固定搭配,后面可加动名词、名词或代词.
例如：I can see no reason for his behaviour.
或 Do you know the reason for his absence?
如果用reason of 那通常只用在by reason of这个短语中,这是个很正式的说法,意思是由于…….
例如：He was found not guilty by reason of insanity.他因为精神失常而被判定无罪.