Manual wheelchair ramp can be applied for Low Floor City bus, and installed under the side of passenger door’ step. When the bus arrives at bus station, the driver unlocks the front cover and draws the platform of the ramp out. After the platform reaches final position, rear-end of the ramp will be raised to eliminate height of threshold of passenger door so as to ensure rear-end of the platform level up to the bus floor, convenient for wheelchair to access the bus. After the wheelchair gets on the bus, retract the platform manually.