Abstract: The author's research in this paper consists of: 1) By way of example for the strong continental .crustal earthquake with magnitude Ms7 in China, the relations between a rised and falen seismicity have been discussed by using bi-value logical variable, the result for research declares that there are not high historical corresponding percentages for the abovementioned relations, which is only an un-ideal relation; 2) In order to together utilizing these un-ideal relations, to reform them into an ideal relation, and make the ideal relation adequate for earthquake prediction, author puts forward that to carry out an integrated earthquake prediction regarding a combined re- lation between a rised and failed seismicity by using the method for logical algebra function, and particularly, by use of 25 predicting factors refering to the data in 60 years, the logical algebra function equations which are useful to judging annual risk o'f the strong continental crustal earthquake with magnitude Ms7 in China have been established, there are very high historical corresponding percentages as far as these equations, the tests of their extrapolation are also very good. And finally, the prospects applying the method for logical algebra function to seismology have been discussed necessarily.