Abstract: The technological arrangement is a key in the plan of the log yard.The article gives conception and definition of the technological flow and arrangement,points out drawing method of the technological flow chart.On the base of the study on various technological arrangements of log yard at home and abroad,we summed up the six essential types of the arrangement.There are single flow,double flow,divided flow,combine flow,counter flow and cross flow.This paper further gives features of these flows,discusses basis and calculation method of the flow forks for every yard operation.Finally it gives principle and method of the technological arrangement,especially regard the log sorting line as an important consideration.