Plasma diagnostics systems are studied and designed in detail for tokamak KAERIT. The systems for the electron cyclotron emission (ECE) receiver, the soft X-ray spectroscopy, visible light spectroscopy, static electric probes and data acquisition to process the diagnostic data are planned to develop. Also studied for detail design in the next year are the systems for mm wave interferometry, vacumm-UV light spectroscopy and neutral beam detection. The ECE receiver is designed in single channel at 93 GHz aimming to get high sensitivity. The soft X-ray spectroscopy system consists of a carbon target which emits electrons by X-ray and an energy analyser for the electrons. The electric probe is designed in tripple electrodes and capable of detection in real time mode. (Author).