Method for drying polyolefins

In a method for drying poly(.alpha.-olefins), which comprises the steps of subjecting poly(.alpha.-olefins) containing a hydrocarbon medium to centrifugation in order to remove most of the hydrocarbon medium and drying the poly(.alpha.-olefins) thus treated in a drying machine until the content of the hydrocarbon medium comes in the range of 0.2 to 2% by weight, the improvement which comprises supplying nitrogen gas having a dew point of -10.degree. C. or lower into a silo type through-flow drying apparatus from the lower part thereof and contacting said poly(.alpha.-olefin) having a content of hydrocarbon medium of 0.2 to 2% by weight with said nitrogen gas in counterflow in said drying apparatus, the amount of nitrogen gas supplied being 20 to 40 Nm.sup.3 per 1 ton of the poly(.alpha.-olefin), said drying in the silo type through-flow drying apparatus being carried out at a temperature of 70.degree. to 130.degree. C. and a retention time of the poly(.alpha.-olefin) of 0.5 to 20 hours.