The invention discloses a partition searching method used for an SPH algorithm. The method is characterized by including the following steps that a simulation model for simulation analysis is created, and initialized setting is conducted; the pressure value, the stress tensor and the artificial viscosity value of each particle corresponding to the simulation model are calculated; searching and analyzing are conducted on the simulation model in each set time step; internal searching of each determined partition and area searching of the boundary of each determined partition are conducted through searching and analyzing; a state equation and a control equation corresponding to the simulation model are calculated; a corresponding simulation result is output on the basis of set termination conditions. By means of the technology of conducting internal searching on the partitions and the like, the partition searching method has part of advantages of tree searching, and does not need to face the stack overflow or excessive deep recursion problem in the recursion process.