The SSC-LINAC project is launched at Institute of Modern Physics in China to develop one new linear accelerator (LINAC) injector for separated sector cyclotron (SSC). It includes a high charge state ion source, a CW RFQ and a DTL section, and is designed to accelerate ions up to 580 keV/u, Now the ion source and the RFQ cavity have been installed in the main hall and the beam commissioning has been carried out. Two kinds of ions have been tested, O-16(5+) and Ar-40(8+). The experiment result of O-16(5+) is: the measured beam current is 180 mu A at entrance of RFQ and 150 mu A at exit of RFQ. The output energy of O-16(5+) is 141.89 keV/u. The measured beam current is 210 mu A at entrance of RFQ and 198 mu A at exit of RFQ for Ar-40(8+). The output energy of Ar-40(8+) is 142.78 keV/u, The experiment results agree with the design parameters of RFQ very well. This paper presents: the design consideration of beam dynamics, RF and cooling structure design; measurement of the cold model; high power test of RFQ and beam commissioning result. (C) 2015 Elsevier B.V. All rights reserved.