总结了城市可持续发展面临着占地多、交通堵、停车难、步行难、能耗高、效率低、治安差、不宜居及交通事故频发、交通投资巨大等十大难题，给出了破解这些难题的基本公式；在各项基本公式的指引下，由诸多复杂的城市模式方案中升华而产生的节约·生态·畅通城市新模式(JD模式)一旦得到推广，十大难题将全面破解，城市宜居指数将提高1倍；可持续发展的城市格局不应该像象棋棋盘一样锁定中心位置，而应该像围棋棋盘一样各个中心的位置可以在发展中形成和变化，这就是城市泛中心论。

Ten major difficulties facing city's sustained development are summarized, including too much land occupied, traffic jam, difficulty in parking, difficulty in walking, high energy consumption, low efficiency, poor public security, unlivableness, frequent traffic accidents and high investment in traffic facilities. The basic formulas for solving these difficulties are presented. For example, traffic supply density > traffic demand density is the basic formula for addressing traffic congestion. Only when the inequality becomes realistic can the traffic problem be soloved. Based on every basic formulas, a new unimpeded city mode is sublimated from many complex city mode schemes. Once the new mode in introduced, the ten major difficulties will be solved in an all-round way, and the city's livableness index will be doubled. For the sustainable developing city pattern, the centre position should not be locked at a certain place like in the case of playing chess, instead, the positions of every centre should be formed and vary along with the development just like in the case of playing a game of go. That is the doctrine of nonspecific city centre.