In this paper

the characteristic of self-affine fractal H-value of earthquake frequency in Jiangsu Province and adjacent areas is studied

and the retrospective prediction test to the earthquakes（M≥5.0） in this region since 1970 is made.It is indicated that the H-value is between 0.59 and 0.99

which illustrates that the earthquake activity has both determinacy and randomicity as well as persistence.It is also indicated that the abnormal variation of lowering H-value is preferably corresponded to the earthquakes（M≥5.0） in the predictive efficiency evaluation of the earthquake examples in this area

and that the R-value derived from retrospective prediction test to the earthquakes（M≥5.0） in this region since 1970 is 0.365

therefore the H-value can be used for predicting earthquake in Jiangsu Province and adjacent area.It is worthy using H-value to explore the dangerous period of time for the possible earthquakes to occur.