The thinking of "Pattern Across-Domain Mapping with Mutation" in knowledge innovation is proposed herein.Based on this thinking,the paper analyzes the theory system and application cases of "Plant Growth Simulation Algorithm(PGSA)".PGSA is an intelligent optimal algorithm,which looks plant phototropism growth pattern as its heuristic criterion.The application of PGSA in different fields shows that the across-domain mapping with mutation of the given patterns(such as Plant Growth Simulation Patte...