Blood vessels have been studied as an important factor in normal tissue and tumors during cryosurgery. It is of great significance to study the effects of blood vessels during the freezing process. A three-dimensional heat transfer model based on a flexible cryoprobe was established to study the effects of blood vessel during cryosurgery. A tumor model with blood vessels (R= 0.7 mm) was utilized to study the effects of blood vessels at a distance of 3and 6 mm from flexible cryoprobe with different directions. The effects of blood vessels within a temperature distribution

at contours of ﹣1

﹣8

﹣20

and ﹣40 ℃

and the degree of tissue damage were analyzed. The results show that the greater the decrease in distance between the blood vessels and flexible probe

the greater the effects in temperature distribution. A blood vessel of X = 3 mm has the greatest impact on temperature distribution while a blood vessel of Z =﹣3 mm has the minimum impact on tissue damage. There is a great impact on temperature distribution when the blood vessels are parallel to the flexible cryoprobe and a great impact on tissue damage when the blood vessels are perpendicular to the flexible cryoprobe.