In 2016,the RF department mainly focused on RF commissioning of HIMM and room temperature linear accelerator,specially the R&D of synchrotron RF system in HIAF project of the 12th Five Year Plan.After all the efforts,many important results have been obtained.We have made measurement and calculation of a few different MA cores from Germany and Chinese company at firstly,and then designed the synchrotron RF cavity(see Figs.1 and 2)according to the measurement results.