Abstract: In order to improve the accuracy of the high frequency prediction method, a refined usable frequency prediction method suitable for high frequency prediction in East Asia is proposed. The temporal characteristic model for the conversion factor of OWF-MUF and HPF-MUF for F₂ layer is reconstructed based on ionospheric critical frequency of F₂ layer, which was observed at eight ionosode stations from 1948 to 2006. And the spatial distribution over East Asia was reconstructed by the improved Kriging method. Using the systematic observation which was obtained by six circuits received in Shenyang and Jingyang during April 2015 and January 2018, the prediction error of the proposed method was compared with other methods. The result show that the predicting accuracy is effectively improved by using the proposed method. Specially, the conversion factors of OWF-MUF and HPF-MUF for the proposed have significantly improved the average root-mean-square error by 0.029 0 and 0.007 3 compared with the ITU method, and 0.003 4 and 0.007 5 compared with China's regional refined prediction method. This study provides potential support for improving the accuracy for high frequency communication.