It is necessary for landscape architecture to change the concept, goals, and measures in response to the different situations and requirements of the new green and high-quality development stage. Based on analyzing the dilemmas, such as the contradiction between man and land is becoming increasingly prominent, the imbalance in development remains evident, the service capacity needs to be improved urgently, the characteristics are insufficient, and the development model is unsustainable. Based on the principle of combining problem-oriented, goal-oriented, and implementable-oriented, and drawing on the successful experiences and practices of progressive cities in China, this paper put forward the implementation path of “five modernizations” (systematization, synergy, intelligence, human culture, low carbonization). Furthermore, it proposed that we strengthen cooperation with other professions and comprehensively improve the level of planning and design, construction, maintenance management, operation, and maintenance with the help of new technologies, which will provide a reference for promoting urban green and high-quality and sustainable development.