This model utility disclose a fixation structure for vertical pipe of handlebar of a bike and is applicable to fix the handlebar, fore fork and head pipe of the frame of common bikes and foldaway bikes. As to the bikes relating to this model utility, the two ends of the head pipe of the frame is provided with bearing cup set, the vertical pipe of the handlebar is inserted into the head pipe of the frame, the bottom end of the vertical pipe of the handlebar protrudes out of the head pipe of the frame, the top of the fore fork is provided with a clamping ring holding the bottom end of the handlebar and the fore fork is connected with the vertical pipe threads of the handlebar, which avoid the defects arising from traditional connections, for example, the fore fork protrudes out of the head pipe and the handlebar is much larger, thus the handlebar is weak in strength and bad in appearance.