The CDU/CSU and the SPD formed the third grand coalition government in the history of the Federal Republic of Germany in December 2013.Because the opposition is relatively weak，this gives the grand coalition government large operation space.But there were discordant voices inside the coalition shortly after the government came to office.The trust within the coalition government got compromised especially because of the Edathy scandal.The grand coalition government has set new goals in domestic and foreign affairs：the most concerned issues of the new government in internal affairs are the introduction of the statutory minimum wage and the achievement of successful energy transition.Differing from the restraint foreign policy of the former coalition government between the CDU/CSU and the FDP，the new government has already shown its willingness of making adjustments in diplomatic practice，which is pursuing proactive foreign policy.However，as Germany has been economic interest oriented since the German Reunification and become more and more inward-looking，whether the new grand coalition government could lead the country to become an outward-looking shaping power depends much on whether it can overcome the constraints on domestic affairs，including its “culture of restraint” and the limit of its strength.