5t mini crane walks on a hydraulic crawler with hydraulic winching, stretching, up & down and slewing systems. Mini crawler crane adopts advanced design methods and idea like solid works 3D, ANSYS Element analysis of limit and computerization of total machine. Therefore, crawler cranes have many advantages such as better flexibility, convenient operation, compact structure, stable performance, reliable application and convenient maintenance. The mini spider crane is widely applied in narrow space where heavy-duty crane could not get in.