1. It is the first small tonnage crane that hitching device is used in auxiliary system to satisfy the harsh requirements for axle load in different areas, quick connector is adopted to realize quick inserting and pulling. 2. Pressure cutoff valve with special structure is adopted to avoid the pressure impact during operation and eliminate the shaking during hoisting. 3. 5-section boom with dodecagon cross section makes it have strong bearing capacity, small deformation during lifting operation and wide working range; special slide block, alignment device design and high strength steer plate give the boom light weight, good rigidity, smooth telescoping, reliable alignment and powerful lifting capacity. 4. Double-cylinder plus rope telescoping mode is adopted in telescoping system, higher telescoping efficiency is achieved. 5. Built-in planetary gear reducer is used in main and auxiliary hoist systems, single pump or double pump oil supplying can be realized, various speeds like low speed with heavy loads and high speed with light loads can be achieved, with high working efficiency. 6. Planetary gear reducer and normally closed brake are adopted in slewing system, spur type slewing ring is driven by the motor, buffer valve is equipped in hydraulic system, which can realized free sliding and stable inching. 7. LMI, anti-two block, outrigger pinning device and level gauge are equipped, also humanized illuminating devices are equipped for night operation. 8. Intelligent computer integrated programmable control system has different control strategies for compulsory release of every working conditions, which makes the operation safer. 9. All covering enclosure and circular arc counterweight show the true qualities of elegance. 10. Push-pull operator's cab with air-conditioner, roll-up sun shield and adjustable damping seat equipped, sound insulated and heat insulated, ergonomics principle is put into effect, more comfort for operation. 11. Forward control driver's cab and all covered walking surface are adopted in chassis, double H-shape outriggers are equipped without 5th jack, 360° slewing operation can be realized, various configurations are available in power system. 12. The whole vehicle features low center of gravity, good stability, high traveling speed and strong grade ability, maneuverable and flexible, convenient for fast transferring at working sites.