We have designed several models of flatbed trolley, non-power towed trolley, motorized flat trolley, trackless transfer trolley to improve the security and efficiency during the transporting process. Over the years, we analysed the problem during the transferring, and we designed a trolley which has better structure and mechanism. This trolley is connected with the tractor by a pin, which is easy to be removed. The tow bar could be installed both the front and the tail of the trolley. The four wheels are connected by steel bars to assistant to the turning. This kind of trolley has been applied in many fields for transportation during the warehouse and workshop, which has been defined as cost savings, labor savings and highly secure during in use.