本动物实验提示65W功率的激光照射所致的肛管粘膜溃疡表浅,且很快愈合。照射时间缩短,照射分散多点,则照射区形成的疤痕范围大,这有利于内痔的萎缩。应用此原理,我们已用Nd-YAG激光治疗内痔和混合痔248例,即期疗效好。152例经随访一年以上,其便血、痔脱垂和排便不通畅现象有显著改善,其发生率分别由96.4％、76.6％和46.8％下降至2.8％、22.9％和6.9％。我们推荐65W功率的激光多点照射法。Ⅲ°环状痔的效果尚有待进一步提高。 This animal experiment suggested that the ulcer of the anal canal caused by laser irradiation at a power of 65 W was superficial and healed quickly. When the irradiation time is shortened and the irradiation is dispersed in multiple spots, the range of scars formed in the irradiated area is large, which is beneficial to the shrinkage of internal hemorrhoids. Using this principle, we have used Nd-YAG laser to treat 248 cases of internal hemorrhoids and mixed hemorrhoids with good curative effect. After 152 patients were followed up for more than one year, their blood, sputum prolapse, and defecation were not significantly improved. Their incidence decreased from 96.4%, 76.6%, and 46.8% to 2.8%, 22.9%, and 6.9%, respectively. We recommend 65W power laser spot irradiation. The effect of III° ringworm has yet to be further improved.