Enthused about the security state of Park Chung-hee times，the Korean people affirm the security ability of Park Geun-hye who is the daughter of Park Chung-hee. This not only becomes the main reason for Park Geun-hye election，but also becomes the important factor to maintain the satisfaction of Park Geun-hye government. The security strategy of Park Geun-hye emphasizes “trust” as the keyword，which includes the meaning of balance and responsibility. By this way，Park Geun-hye tries to deal with the North-South relations in Korean Peninsula，bilateral and multilateral relations out of Korean Peninsula. On the basis，Park Geun-hye puts forward a series of specific implementation plan，such as “trust-building on the Korean Peninsula”，“trust process in North-East Asia”，“a vision of peaceful North-East Asia”，and just so on. The trust diplomacy of Park Geun-hye will influence Korea-US alliance because the relationship between Korea and US is still the most important part in Korean diplomacy. The Park Geun-hye government wants Korea-US alliance changed from asymmetric alliance to symmetrical alliance，from military alliance to comprehensive alliance，and from against North Korea alliance to global alliance. However，the attitude of the US and the conditions of international environment have not provided full support for the change. As a result，the characters of Korea-US alliance，such as symmetry，military，and against North Korea，will not change in a short time.