The diaphragm has a contraceptive effect only after it has been dissolved in the vagina for five minutes, and the effect lasts for half an hour. To take the contraceptive film, you need to pay attention to the placement time and location, if you do not pay attention to the effect of contraception will be affected. 1. Placement time: to be placed in the vagina five minutes before intercourse, five minutes before sexual intercourse, and if the sexual intercourse time is more than half an hour, you need to place the contraceptive film again. 2. Placement position: the diaphragm needs to be placed deep into the vagina, if the placement position is relatively shallow, it may not achieve the role of contraception, which may lead to unwanted pregnancy. The correct use of the diaphragm, contraceptive rate is relatively high, can reach more than 95%.