Not only one of the world's most remarkable sports facilities but also the first Public‐Private Partnership sport facility in China, the National Stadium for the 2008 Beijing Olympics Games has drawn much attention, received much help, produced much political debate and experienced multiple risks during its development and construction. But, at last, it was completed in time with good quality and at a reasonable cost. It played an important role in facilitating the success of the 2008 Beijing Olympics Games, giving an indelible impression to the world. This article reviews issues that arose during the stadium's development and construction and considers the risks encountered and lessons drawn. The construction and management arrangement was widely considered to be a public‐private partnership, but it is important to note that the so‐called private side consisted of a mix of public, blended public‐private and fully private organisations.

The traditional particle PHD filter only uses kinematic characters and parameters to measure,However,when the kinematic characters of targets are similar with each other (in distance,location,speed,acceleration,etc.) the weighted measurement will become more and more similar,so the tracks of targets will be closer and closer to each other.Eventually the tracks will mingle with each other and can not be distinguished,thus causing misjudgment and failing in achieving accurate tarcking.To solve such kind of target tracking problem,this paper proposes the particle PHD filter tracking algorithm based on multi-parameter assistance.That is,the target property information and parameters will be imported into the algorithm and the measurement difference is increased by calculating the combined likelihood value of the target property parameter and the kinetic character parameter,and then the combined likelihood value is used to update the particle PHD to filter miscellaneous waves and update multi-target State collection.The simulative analysis will enable the proposed algorithm to realize the short-distance multi-traget tracking and filtering in complex environment.