" Wound healing/scratch assays" are a common choice, as are individual cell tracking assays. These references describe some:

https://www.sciencedirect.com/science/article/abs/pii/S1046202305001374

https://www.frontiersin.org/articles/10.3389/fcell.2019.00107/full

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Article Cell Migration - Methods and Protocols

Ellen A G Chernoff ,is it also suitable for studying the cell-cell interaction?

The wounding model can be modified to examine the interaction of 2 cell types. In the simplest case, a barrier is placed in a dish and different cell types seeded on each side. When growth is establishe, the barrier is removed. Patterned substrates are a more sophisticated variation of this theme.

Article A simple and Rapid Method for Generating Patterned Co-Cultur...

Article Modulation of Heterotypic and Homotypic Cell-Cell Interactio...

https://m.youtube.com/watch?v=iP7LcVBhE8k

Ellen A G Chernoff , thank you very much for your answer. It's very helpful.