City large square is a space with specified theme and scale that is intended to meet many kinds of social life need in city.

Research on Requirement Engineering Structure of Large-Scale Events;

Frequent large-scale events impose heavy pressure on urban traffic management.

This paper puts foreword impact factors about traffic mode choice under large-scale events,and the author mainly analyzed that the events holding spot,traffic management measure and the scale of the event bring the impact to traffic mode split.

Through a comparison of characteristics of traffic impact evaluation between large special events and large commercial developments, and based on an analysis of influencing factors of traffic management for large events, this paper formulates a travel forecasting method for both one-time (nonrecurring) and recurring special events.

Large special events bring about great impact to urban traffic, how to ensure the safety, speed and unblock of traffic evacuation and reduce the impact on normal traffic during large special events is a difficult problem to traffic manager.

Focusing on private car travelers from other cities dur-ing large special events,this paper conducts a survey and research on park-and-ride selection behaviors.

A Risk Assessment Methodology for Major Events Security;

With the development of social politics and economy, the number of major events is increasing, so is the number of security accidents.