Objective: Cone calorimeter sample shape and size affect its experimental results. In order to clarify whether the powder samples are appropriate for CONE tests or not, seven different forms of wood samples were investigated by cone calorimeter. Study on the influence of sample shape and size on cone heat release parameters have important significance on selecting heat release parameters, evaluating combustion process and researching flame retardant mechanism. Method: Seven different processing methods and forms of wood samples were investigate...