Abstract: In this paper, a variety of fundamental construction algorithms of null model for un-weighted networks, weighted networks, and temporal networks have been reviewed, especially the construction of null models based on randomized algorithms and their practical applications have been summarized. Randomized algorithms can not only rewire edges of networks, but also randomize some factors on the condition of keeping the original connection. By analyzing and comparing randomized algorithms, this study is helpful for researchers to know how to use randomized algorithms to construct null models of complex networks, and this study is useful to calculate relative values of various statistics by comparing the original network with its null model. Furthermore, this work can deepen our understanding and utilizing various complex systems.