These seven papers are based on memristor chaotic system design, fractional chaotic system design, system hardware implementation and parameter identification. The research of these articles is very distinctive and innovative, which provides new ideas and methods for the design and characteristic research of memristor chaotic system. These two papers apply memristor to signal detection and neural networks respectively, which are very novel. The application field of memristor is expanded.Finally, I'm appealing to researchers and readers to support Frontiers in physics. Please consider submitting your best research to Frontiers in physics.Thanks to all the staff of Frontiers in Physics, editors and reviewers.