To solve the problem that SAT solvers usually has excessive backtraces during assigning binary values to an unassigned variables,a new SAT solver based on symbolic simulation and variable partition,which lower not only the number of backtrack but the memory blow-up,was presented.

The paper introduces the history,basic technology,and the drawback of BDD blowup of symbolic simulation.

We propose a method of implementing a symbolic simulation system which uses symbolic simulation and BDD.

According to the fact of existing mapping relations between cartographic region and the subjective cognition structure, this paper brings forth the definitions of imitative map symbol and virtual map symbol, studies the rule of their evolution, puts foward the mathematical model for maps of planning and forecasting as well as the definition for geo-cyberspace.