Regardless of whether the stones are located in the renal calyx, renal pelvis, ureter or bladder, the impact of urinary tract stones on pregnancy depends on whether there is coexistent urinary tract infection and renal parenchymal damage. Pregnancy with urinary tract stones is rare, with an incidence of 0.03% to 0.35%. It is generally believed that the incidence of stone disease during pregnancy is not higher than that of non-pregnant women. There is secondary hyperparathyroidism during pregnancy, but it does not promote urinary tract stones. Because the protective effect of colloids in urine is enhanced during pregnancy (increased mucin excretion), the crystal substances in urine can still be maintained in a supersaturated state without precipitation. The blood calcium and blood phosphorus of normal pregnant women are both in the low range of normal values, which proves that pregnancy has no promoting effect on the formation of stones. When pregnancy is complicated by stone disease, as far as the stones themselves are concerned, there is no obvious adverse effect on pregnancy and fetus, and the pregnancy can continue, and further examination and treatment can be done after delivery; if the symptoms are severe, the stones are complicated by infection, pyonephrosis, and renal parenchymal damage, the pregnancy should be terminated or even the kidney should be removed.