In order to return the sisal stalks into soil properly as the organicfertilizer，the net bag method and pot experimentwas carried out to study the decomposition characteristics and nitrogen utilization efficiency of sisal stalks.The resultsshowed that there was a high decomposition rate on the sisal stalks and leaves base，at 240 days after the crushed stalksreturning field，which were respectively up to 72.4% and78.9%.The release rates ofN，P and K in the sisal stalks was88.4%，72.7% and94.9%，respectively.And the release rates ofN，P and K in the sisal leaves base was88.0%，74.4%and95.5%，respectively.The period of rapid decomposition of the sisal stalks and leaves base were all among 30days，andthe period of quick releasing ofN，P and K were also among 30days.The order of decomposition rates of different nutrientsin the sisal stalks and leaves base wereK>N>P.The rate of N absorbed from soil was well above the rates from the urea andcrushed sisalstalks，and the rate from sisal stalks was higher than theurea.The nitrogen utilization rates of sisal stalksunder single and combined application were 5.1% and4.3%，respectively.Inconclusion，the rate of N absorbed from sisalstalks and urea all reduced when the sisal stalks applied combining withurea.