Kidney crystals generally do not require special treatment. Kidney crystals are usually the precursor of kidney stones, mainly due to the concentration of urine, the analysis of the sediment or salt in the urine to form crystalline components, and the patient’s lifestyle habits. Kidney crystals are usually found during physical examination and are small in size, mostly below 3mm. The occurrence is mainly related to the patient’s low water intake, living in a hot environment for a long time, eating foods rich in sugar, salt and calcium, suffering from hyperuricemia or hyperparathyroidism, and other factors. The occurrence of kidney crystals requires regular observation to understand the changes of kidney crystals, as well as drinking more water to increase the amount of urine, dilute the crystals and help it excrete out of the body. Moreover, patients should also avoid foods with high oxalic acid content, such as spinach, strong black tea, coffee, chocolate and prunes, etc. They should have a high fiber, low protein diet and do moderate exercise to promote the discharge of crystals to avoid further development of kidney stones. Patients with kidney crystals should pay attention to avoid vitamin C-rich drugs and supplements in daily life to avoid promoting the growth of crystals.