Main operating mode of SPC600 truck mounted water well drilling rig is rotary –mud positive cycle drilling. Equipped with other drilling tools, SPC-600 truck mounted water well drilling rig could also use other drilling ways. The drilling rig could be available in clay, sand, gravel, rock and bedrock.
   During the initial process, pressurizing the drilling tools by pressure mechanism could help increase shallow hole drilling efficiency. Until the drilling tools weight is more than the essential pressure, decompression drilling should be used.
   The rotary drilling openings the early auxiliary pressure drilling to improve into the hole drilling efficiency, with the hole depth increase when the weight of the drill exceed the necessary that add the pressure of the drilling can realize drilling currently decompression.