Abstract
By applying the mastersymmetry of degree one to the time-independent symmetry K1,the fifth-order asymmetric Nizhnik-Novikov-Veselov system is derived.The variable separation solution is obtained by using the truncated Painlevé expansion with a special seed solution.New patterns of localized excitations,such as dromioff,instanton moving on a curved line,and tempo-spatial breather,are constructed.Additionally,fission or fusion solitary wave solutions are presented,graphically illustrated by several interesting examples.