device： High-tech disposable tissue suction set for uterine cavity tissue is produced by Xi'an Mejiajia Medical Equipment Company ; The participants will be use the disposable tissue suction set during the induced abortion procedure.

device： Traditional metal instruments for induced abortion procedure; The participants will be use traditional metal instruments during induced abortion procedure.

Induced abortion is a main backstop for terminating unwanted pregnancies, however, traditional hard metal instruments has lots of insufficiencies such as easily tissue damage, and repeatedly sterilization increases the incidence of cross infection in the hospital what leads to more complications of pelvic inflammation, infertility and so on. Therefore disposable non-metallic instruments are desperately needed as a way to decrease the complications and provide better medical services to patients. So, the investigators want to explore the clinical effect of disposable tissue suction tube set and make comparison with traditional metal instruments.

It always takes 5-10 minutes to finish the induced abortion in the outpatient, so the investigators will measure the blood loss during the operation time.

It always takes 5-10 minutes to finish the induced abortion in the outpatient, so the investigators will observe whether induced abortion syndrome happens to our patients during the operation time.

The participants will be asked some questions on questionnaire about feeling to evaluate their pain grade.