In essence,Before i little knew about human cloning.I heard of it from other person.Nevertheless now,i have a little informed of human cloning since i read the essay《Second thoughts on cloning》.Maybe we all knew,human cloning have advantages and disadvantages,of course,different people have different the opinion.   Some people hold optimistic views on human cloning.For instance,more and more parents want a perfect child or twins and the rest.Latest research is turning these dreams into reality. A part of people are critical of it.They think human cloning go against "natural regulations",what's worse,it is simply wrong ethically from a medical standpoint and a scientific standpoint. As far as i concerned,i maintain doubtful attitude.To begin with,i think we should obey birth of natural regulations.In addition,it is not going with morality.Last but not least,if someone can't give birth,they don't condemn for artificial insemination,in vitro fertilization or surrogate motherhood.what We all knew,they must have confused.Therefore,we should have sympathy on them.