Abstract: This paper discussed the construction,the function and the application of a small mobile m ultipurpose spar yarder and loader.It ite sted that it can be used to yard uphill as a mobile spar yarder and downhill as a mobile skyline without spar,to load as a mobile hydraulic loader along the forest road for the logging truck in the cutting area.In this condition,it is unnecessary to set up any static skyline for loading,to construct the static landing.In the wood yard,it can deck up and load for the trains or the trucks and prepare logs for loading.In water transportation,it can dump the logs into the water,take down the stack in the water,pick up the logs from the holding area and finish some operation of the river engineering.When collecting the scattered logs,it can also transport the logs with the tailer.Having compared with the domstic and oversea similar equipments,we found that it had following advantages:multiple function;simple transfer system;compact construction;simplifed the productive technology;shortened the skidding distance;higher productivity;lower cost of construction and operation;remarkable social and economic benefit.