XJ700-W/XJ900-W free standing workover rig, newly developed by our company, is a kind of highly efficient and stable well servicing equipment. This equipment can be equipped with SHACMAN TRUCK or SINO TRUCK special purpose chassis. The emission level of the diesel engine complies with China National IV standard. The structure of “harmony between vehicle and machine”, hydraulic & mechanical transmission system, pneumatic and hydraulic control system, have prolonged the service life of diesel engine and gear box. The chassis is complete with extendable support jack, which can increase the vehicle width support to 5.5 meters when the workover rig is working, ensuring the stability of the workover rig; a support draw rod of 8.8 (9) meters long is added at the rear end of the derrick, when can prevent the damage to the workover rig from resilience of the derrick when the oil tube is pulled apart, ensuring the stability and security of the workover rig. The free standing workover rig has achieved well servicing operation without outer anchor line. It is especially applicable to oil and water well servicing in small well site and farmland, near the building.