Abstract: To verify whether the fundamental equations among traffic volume, density and speed hold for pedestrian traffic flow, methods of analogy analysis and error analysis were used to establish the methodology and procedures for examining the applicability of the fundamental equations. Pedestrian traffic data including volume, density, and speed on level walkways and stairways were collected. The observed density values were compared with those converted by the fundamental equations to analyze the errors between them. The results show that for the pedestrian flow on walking facilities with boundaries, the relative error of parameter conversion by using the fundamental equations could reach more than 20%-25% in very low and high density conditions. What's worse, the application of fundamental equations likely leads to a wrong conclusion that the pedestrian flow and speed can be still high in high density conditions, and even loses some high-density data. The truth is that the traffic flow fundamental equations do not hold strictly under real pedestrian traffic conditions, and hence should not be applied for parametric calculation in theoretical research of pedestrian traffic capacity.