Abstract: An experimental research was conducted to investigate the effect of the arrangement of staggered pin fins on convective heat transfer of rotating rectangular ducts.Six test models were used in this experiment, which cover a parameter range of S_n/d =5.0,6.5 and 8.0, S_p/S_n =1.2,1.6 and 2.0,where d is the diameter of the pin fin, S_n and S_p ,are the transverse space and twice the axial space between pin fins respectively.The results in the experimental range show that,the axial parameter, S_p/S_n between 1.2 and 1.6 will give the best result;in the transverse direction S_n/d=5.0 gives the highest heat transfer coefficient,but the pressure drop caused by this arrangment should be considered.