The level 1 trigger system for Belle II CDC

The SuperKEKB collider has started its beam commissioning this year and is expected to have first collision for early physics next year. To efficiently select physics events in interest at high luminosity rate, a multifunctional trigger system is designed. In this presentation, we introduce the tracker trigger system associated with the Belle II central drift chamber (CDC) detector. This sub-trigger system is designed to perform a quick track recognition in 2-dimentional and 3-dimentional spaces. The design structure, current status, and performance studies will be discussed.